Source Slim 4 Wax Pen Review - Slim Jim
Build Quality83%
Vapor Quality85%
Look & Feel85%
Ease of Use83%
80%Overall Score

Source Vapes, a company that we all know very well by know has recently released a pretty cool new vaporizer pen for wax concentrates. This new model is called the Source Slim 4 and is a welcomed addition to the already successful series 4 line offered by Source Vapes. The Slim 4 model is compatible with atomizers from the other series 4 devices. In this article we will touch on the build quality, vapor quality, look and feel, discreteness, portability, ease of use, and overall assessment of the Source Slim 4 wax vaporizer pen.

If you’re looking to explore all your vaporizer options available, we have the Vapesterdam Ultimate Wax Pen Buyers Guide here to help illuminate all the wax pen choices available to you.

Product Pros

  • Compact size
  • Simple to use
  • Built in concentrate container
  • 2 atomizers included

Product Cons

  • Can get hot with the dual quartz atomizer



Source Slim 4 Wax Pen Review: Breakdown


Source Slim 4 Wax Pen Deconstructed

Build Quality

Build Quality

The Source Slim 4 is built with a stainless steel exterior making the housing very durable. Overall the manufacturing quality of this wax pen is way above industry average and right on par with the wide range of vaporizers offered by SourceVapes like the Source Orb 4 Premium Kit. The Slim 4 is a simple and sleek vaporizer that is designed very sturdy and would be a difficult device to break.

One of the most impressive aspects about this vape pen is definitely the size and what it packs into the small 4.7” tall design. The Slim is not as curvy and shapely as the Orb 4 by Source Vapes but the simplicity of the Slim is one of the reason why I liked this device so much.

Located at the top of the Source Slim 4 on the mouthpiece is an airflow control that you can use to adjust the airflow to your liking. The ability to adjust airflow can help to make your draws feel more natural and to increase vapor production or increase flavor. The Slim 4 comes with 2 atomizers which is a nice touch and also this devices battery is backed by a lifetime no hassle warranty.


Vapor Quality

If you have used one of the other series 4 devices from Source Vapes you will already have a pretty good idea of the vapor quality that this vape produces. All the series 4 devices are compatible with the same atomizers which result in fairly similar vapor quality.

The Source Slim 4 package comes with 2 atomizers as we mentioned above – the Source Nail Coil-less quartz atomizer and the Dual Quartz coil atomizer. The dual quartz atomizer is the one you will want to use if you’re looking for more visible vapor and denser clouds with your hits.

On that not however the dual quartz atomizer also tends to get a bit hotter and may at times irritate your throat. The second atomizer that comes with the Source Slim 4 being the coil-less atomizer is much smoother, produces better taste, but slightly less visible vapor.


Source Slim 4 Wax Pen


Look and Feel

We have no complaints on the look and feel of the Source Slim 4. The pen is small, durable, fits easily into your pocket, doesn’t break easily and boasts a built in concentrate container to carry your material.

Overall the design is solid and for the competitive price of Source vaporizers you get a good deal. There is one thing that some people would like to see perhaps down the line with the Source Slim 4 and that is additional color options.



The Source Slim 4 is a small enough device that you can actually conceal the whole thing in your hand. The height is under 5 inches tall at just 4.7” so if you have average size hands this will be easy to use discretely if that’s something that matters to you.

To be honest, being discrete about your vaping is not something that matters as much as it used to (obviously depending where you live), but more people nowadays attach cannabis use to medicine, so really it’s your own personal behavior that would make people think otherwise.

If you are in a place that is more strict against the use of cannabis that you can adjust the temperature setting to the lowest mode and use the bucket style atomizer to produce less visible vapor. Additionally you can also use the carrying case or keep this device in your pocket to keep it hidden when not in use.

Source Slim 4 Wax Pen Atomizer Detached


Ease of Use

The Slim 4 uses the simple to use 1 button design that controls all the functions of the vaporizer. You press the button 5 times quickly to turn it on and off, you press it 3 times quickly when it’s on to cycle through the 3 pre set temperatures that it comes with.

To prep the Slim 4 for use you will want to make sure that it has been completely charged, its is always recommended to charge your device fully even if you think it is already charged – this will start your battery off strong and make it last. Secondly you should run the Slim 4 through the highest heat cycle without any material in it to clean it of any leftover unwanted residue from the manufacturing process – you can do this with both atomizers.

To load the Slim 4 you will need to remove the mouthpiece and attach one of the two included atomizers. With a dab tool you can grab some of your wax and place it on either the exposed coils of the dual quartz atomizer, or on the bottom of the coil-less atomizer. Once you’ve loaded your material you can place the mouthpiece back on and press and hold the power button while taking a hit.

I’ll touch on the temperature settings here for a second: With the Slim 4 you have control over the voltage by how long your draw is – similar to a vape mod. Each atomizer will heat up slightly different for each of the 3 temperature settings. The 3 temperature settings are set to the following which are indicated by the color of the LED on the power button – Green is Low (2.6v – 3.2v), Red is Medium (3.2v – 3.7v), Blue is High (3.7v – 4.2v).



As you can tell from the size of the Slim 4 this vape was designed for portability. The 4.7” height is small enough to fit into pretty much any pocket (chest pocket might be a bit of a stretch, but honestly who uses that one anyways). The Slim 4 is not quite as skinny as a normal pen that you would right with, but the Slim 4 is small enough and includes components that make the shape that it is necessary. The Slim 4 is all you need to grab if you are in a hurry, just make sure the device has a charge, you remembered to load the concentrate container and you’re good to go.

Source vapes is aware that portable vaporizers are meant for portability, that is why the Slim 4 has a carrying case that gives the already strong build extra protection. The carrying case is also a compact size and something that will not take up too much room in your travel bag.

The battery that operates the Slim 4 is a 650mAh, which is a very common battery size among popular vape pens. For now this type of battery is one of the best options that manufacturers use when going for both battery life and compact portability. This type of battery actually lasts a good length of time and you can expect to get around an hour of actual usage. You are able to get this much time because the oven is also compact and does not require excess battery power to generate the heat level and vapor production you need.


Overall the Source Slim 4 costing less than $100 makes this one of the top deals for quality built wax concentrate vaporizer pens. The Slim 4 is a good device if you are wanting to get yourself a portable and discreet wax pen. A few of the highlights to quickly touch on are the fact that this unit is compatible with a number of different atomizers and comes with 2, one designed more for vapor production and the other for flavor and discretion. The built in concentrate jar is just a great feature that you will not want to go without once you have a device that includes this feature.

If you are looking for another unit that will give you a rig like experience for waxes and water filtration for dry herb, we recommend checking out the Focusvape Tourist 2-in-1 vaporizer.

Thanks for reading our Source Slim 4 Review! Reminder! Don’t forget to leave a leave a comment!

About The Author

Senior Content Specialist

Dan is a writer with a massive vaporizer collection who loves video games, superhero movies, finding new music, comic and regular books and critically deconstructing those things until he wonders why he liked them in the first place. He's also a pragmatic fitness enthusiast who believes that the best actions you can take in your daily life are those that help you reach your goals, and that naps are the most lofty, but also the most noble goal one can have.

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