Source Slim 4 Review

Source Slim 4 Review
8.8 Total Score
Source Slim 4 Bottom Line

The Slim 4 is a standout among Source's product line, especially when you consider what's in its price class. Style is an important element for every vape brand, but it's clearly a priority for Source. They've got an attention to detail that manifests in every aspect, from the look of the kit to the supremely convenient extra compartment for oil storage at the base of the pen. Ultimately, it's an above par wax vaporizer with little left to be desired. Whether you've been vaping for 6 days or 6 years, there's something made for you to appreciate and enjoy about the Slim 4.

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In Depth Source Slim 4 Review ↓

Source Slim 4 Background

We knew we were in for a treat with the Source Slim 4 as soon as our fingers excitedly hit the keys to write the preview for it back in November.  Their series of vape pens has been consistently top notch so we had a pretty strong sense Source wouldn’t disappoint with the Slim 4 –  we were right.

We love the unpretentious design, its ultra-portability, and every feature that was made with vaping enthusiasts in mind. In this review, we’re going to run through our favorite aspects about the Slim 4 and our best practices for how to get the most out of it. Keep reading to find out why we’re already considering this among our favorite vape pens of the year. 

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Source Slim 4 Review

Source Slim 4 Key Features

  • Only 4.7 inches Tall
  • Stainless Steel 303 Body
  • 3 Temperature Settings
  • Variable Airflow System (VAS)

The Slim 4 kit comes with:

  • Microfiber Cloth
  • 650mAh Battery with built in container
  • Micro USB Charger Cable
  • Dabbing Tool

Source Slim 4 Design

It’s hard to not appreciate the presentation that Source delivers with the Slim 4. Everything from the kit to the vaporizer itself was made with portability in mind, without having to compromise on quality. If you vape on the go, you’ll love how short and lean the Slim 4 is.

At just under 5 inches, you won’t have any trouble slipping this vape into your pocket or purse and because the Slim 4 is in the same weight class as the average cell phone, it won’t feel out of place either.

Stacked up against its contemporaries, the Slim 4’s design holds its ground and is practically unrivaled for its price point

Source Slim 4 Review

Using the Slim 4

The single button on the body of the Slim 4 controls all the functions – on/off, and temperature adjustment. The standard five quick-succession clicks turns it on, and five clicks again turns it back off. When on, three clicks of the button will cycle through the three temperature settings: low, medium and high (green, blue, and red lights, respectively). I personally enjoyed using the medium setting, or blue color, as it gave the best balance between vapor density and flavor vs heat. This also depends on the type of wax you’re using, the denser and more viscous your extract is, the higher temperature the extract will need to vaporize.

The Slim 4 has an easy-to-open chamber to access the atomizer, using rubber rings to hold the mouthpiece in place. The atomizer opening, where you put your concentrates, is hard to miss so it shouldn’t be any trouble to find where to start, even for beginners. I appreciated the fact that the atomizer chamber can hold between 0.2-0.4 grams of concentrate, depending on consistency.

There’s also an adjustable airflow ring towards the top of the mouthpiece which allows you to choose how much additional airflow you’d like. Subsequently, you can leave it all the way closed for a warmer, more concentrated vapor. My preference was the latter, but I’m always in favor of being able to tailor as many features as possible to suit my vaping experience.

The mouth tip is also removable and replaceable, allowing you to swap in your favorite standard sized drip tip in place.

Source Slim 4 Review

Source Slim 4 Performance and Vapor Quality

On the Slim 4 wax pen, you hold the button as you hit it, like most other vapes. The drag at every setting is smooth and comfortable, providing for a pull that’s never too irritating. The vapor’s going to be a bit more wispy rather than cloudy on the exhale, but you’ll definitely pick up on the great flavor with every hit. 

One of my favorite features of the Slim 4, which might be hard to see at first, is the hidden wax stash at the bottom of the vape pen. You can conveniently store about half a gram of concentrate there for easy on-the-go refilling. The user experience with the Slim 4 is top notch, with no major complaints to be had. The one minor snag I had while grabbing it and trying to turn it on was, the button isn’t particularly pronounced or easy to find by feel alone.

The Slim 4’s pronounced flavor makes for a pleasant pull and produces a great taste once it’s fully dialed in

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Source Slim 4 VS Comparable Vapes

The Source Vapes Orb 4 is an interesting device because it uses very similar atomizer coils to the Slim 4, but is inherently meant to be used differently. The Orb 4 is designed to be attached to a vape battery unit, or box mod. These come in all sorts of shapes and sizes, so it’s a little more of an enthusiast option. While this may seem daunting, it is a more effective way of utilizing the coils – you can adjust the power setting and thus adjust how intense the wax vape hits. The level of control is much wider and more granular, so you can really dial in a preferred setting and vape away!

It really comes down to whether you want an easy to use, all-in-one unit, or a more customizable setup. Either way, the Slim 4 and Orb 4 by Source Vapes both have very good atomizer coils and have never failed to give a consistent vaping experience.

The ceramic atomizer heats the concentrate evenly and effectively but requires a bit of warm-up time, so don’t expect the Slim 4 to be ready as soon as it turns on

Source Slim 4 Review

Source Slim 4 Bottom Line

Overall, I see this vape being a crowd-pleaser. The Source Slim 4 offers a price point that makes this the perfect entry-level vape. For a beginner, the Slim ticks off all the checkboxes that I look for when I’m shopping around.

All around, the user experience is impressive, intuitive, and convenient but at times the Slim 4 can be a little oil-hungry and is a fingerprint magnet. You’ll need a good amount of concentrate, but this vape will absolutely get the job done. Based on our sessions with the Slim 4, we’re sure this will be in the running for our favorite pens of the year. 

Where to buy the Source Slim 4

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This review has been written by our paid staff to help you find the best vaporizer for your needs (for more info about our review process click here). If you purchase through our links, you'd be eligible to use our exclusive coupons and save $ (view participating stores). We may get a small fee from partner stores that will help us maintain this website and guide new users such as yourself, towards the perfect vape for their needs (click here for more info).

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