Eventronic 600PCS Heat Shrink Tubing 2:1, Electrical Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box(5 colors/12 Sizes), Black, Red, Blue, Yellow, Green

Why I reached for this kit

Heat shrink is one of those shop staples you don’t think about until you’ve run out of the right size. I picked up the Eventronic heat shrink kit to stop piecing together leftovers from old rolls and to have a predictable, organized assortment at the bench and in the field. After running it through several jobs—automotive splices, a couple of small electronics repairs, cable tidies behind a desk, and a test on a connectorized cable—it’s become one of those kits I keep within arm’s reach.

What’s in the box

The kit includes a broad spread of 2:1 polyolefin tubing in multiple diameters, pre-cut to convenient lengths and sorted by color (black, red, blue, yellow, green). The sizes span tiny leads up to roughly half-inch outer diameter, which covers most typical DIY and light professional needs:

• Small diameters for PCB jumpers, sensor leads, and small-gauge automotive wire
• Midrange sizes for joining two 18–14 AWG wires or insulating spade/quick-connect terminals
• Larger sizes to sleeve small cable bundles or provide strain relief on USB and audio cords

As is common with assortments, there’s a heavier bias toward the smaller diameters and fewer pieces of the largest sizes. The storage box is simple but effective: individual compartments keep sizes separated, and the color sorting makes quick work of identifying circuits or phases without pulling out a labeler. I also appreciate that the pieces are pre-cut; grabbing two or three lengths is a lot faster than cutting off a roll mid-job.

Shrink performance and handling

The shrink ratio is true 2:1. With a heat gun at a moderate setting, each size consistently collapsed down around its target diameter without fish-mouthing at the ends or splitting over solder joints. Even on a series of back-to-back splices, the tubing didn’t develop shiny hot spots or thin out unevenly; the wall thickness after recovery feels reassuring, not flimsy.

A few notes from use:
- It grips well over tinned or soldered splices, producing a snug, clean finish.
- On ring terminals and quick connectors, the tubing conforms nicely to the fitting barrel and wire jacket. You’ll need to choose a size that comfortably clears the connector barrel before shrinking; 2:1 won’t rescue an oversize discrepancy like a 3:1 tube can.
- The colors remain stable under heat; no obvious discoloration or smearing.

For field work where a heat gun isn’t practical, a small butane torch on low or even a lighter works in a pinch. Keep the flame moving and use the blue, tip-of-cone heat to avoid soot. The tubing tolerated this reasonably well during a quick automotive repair, though a heat gun still delivers the most uniform results.

Electrical insulation and strain relief

Polyolefin tubing is the right choice for day-to-day insulation and strain relief. Over soldered splices on 16–20 AWG wire, the finish is tight and durable. On flexible cable jackets (think headphone or USB leads), a longer section provides a useful stress collar. For heavier strain relief, I sometimes use a “double wall” approach: a short piece over the splice and a longer piece overlapping the jacket. This kit’s size progression makes that straightforward.

It’s worth emphasizing that this is standard (non-adhesive-lined) heat shrink. It adds insulation and abrasion resistance, but it won’t bond to the substrate or provide a watertight seal. For marine wiring, battery lugs, or any location exposed to moisture or chemicals, I’d reach for adhesive-lined 3:1 tubing. As long as you choose the right application, the Eventronic kit performs exactly as it should.

Fit, finish, and durability

The tubing has a matte finish with an even wall. I tried to provoke failures by shrinking over slightly irregular shapes and by reheating a second time; no cracks, no brittleness, and no obvious odor during heating—signs of decent polyolefin. After cooling, the material remains flexible enough not to create a stiff hinge point at the edge of a splice, which is important for avoiding fatigue breaks.

On the organization front, the box survived being tossed into a tool bag and jostled around a job site. The internal dividers kept pieces from migrating, and the latch didn’t pop open unexpectedly. It’s not indestructible, but it’s better than the typical flimsy sort you sometimes get with assortments.

Color coding that actually helps

I tend to default to black tubing for most work, but having five colors at hand has been handy for quick identification: red for positive leads, blue for switched circuits, yellow for temporary prototypes, green for grounds in certain harnesses. On network and AV cleanups, colored collars make later tracing a lot less frustrating. If you prefer clear or white for labeling, this particular assortment doesn’t include them, so you’ll need a different pack or to keep a roll of clear on hand.

Permanent markers write legibly on the matte surface of the black and colored tubes, though paint markers hold up best to abrasion.

Real-world use cases I tried

• Automotive splice: Two 18 AWG wires with a soldered Western Union splice, finished with a mid-size black tube. Shrunk cleanly, excellent grip, no cold spots.
• Connector relief: USB-A charging cable with a fatigued strain relief. A larger green tube over the jacket restored support; not a cure-all, but it extended life.
• Small electronics: Heat-shrunk sensor leads on a breadboard harness with yellow and blue color coding. Clean identification, no interference with nearby headers.
• Tool grip accent: Added a touch of grip to a small screwdriver shaft. Good adhesion by friction; adds comfort without bulk.

Across these, the tubing behaved predictably and didn’t split when pushed over mild edges or pre-existing jackets.

Where it shines—and where it doesn’t

Shines:
- General electrical insulation and cleanup work
- Color-coded identification without extra labels
- Quick repairs where pre-cut lengths speed things up
- Tight, clean finishes on soldered splices

Limitations:
- Not adhesive-lined; not intended for waterproof seals or harsh chemical environments
- 2:1 shrink ratio can’t accommodate dramatic size steps; choose the diameter carefully
- The largest sizes are limited in count compared to small diameters, as with most assortments
- No clear/white in this set if you prefer see-through or label-over finishes

Tips for best results

• Choose a tube with an initial diameter 20–40% larger than the largest point it must clear, and confirm it will shrink below the final jacket diameter.
• Slide the tube onto the wire before you crimp or solder the connection.
• Start heating from the center of the splice and work outward to push out any trapped air.
• Keep the heat source moving; avoid hovering on edges to prevent thinning.
• Consider stacking: a short inner sleeve over the joint, a longer outer sleeve for added strain relief.

Value and alternatives

As an all-in-one drawer organizer, this kit hits a practical sweet spot: enough sizes to cover most bench and vehicle jobs without fishing through multiple boxes. If you frequently work on irregular connectors, battery lugs, or need environmental sealing, supplement it with a small assortment of 3:1 adhesive-lined tubing. If you require clear or white for labeling, consider adding a roll of clear 2:1 to your kit.

Bottom line

The Eventronic heat shrink kit does the fundamentals well: consistent 2:1 shrink, good wall integrity, useful color assortment, and an organizer box that keeps the workflow smooth. It won’t replace adhesive-lined shrink for sealing or dramatic size transitions, but for the vast majority of electrical insulation, strain relief, and tidy-up tasks, it’s reliable and easy to work with.

Recommendation: I recommend this kit to electricians, hobbyists, and anyone who wants a dependable, organized assortment for everyday wiring and repair. It’s a solid general-purpose set that shrinks evenly, grips securely, and makes color-coded identification straightforward. Pair it with a small stash of adhesive-lined 3:1 tubing for wet or high-strain environments, and you’ll be covered for nearly any job.