210PCS WIRE HEAT SHRINK TUBING KIT - 4:1 Industrial heat-shrink tubing for wires include: 1/4"(50pcs),5/16"(50pcs),1/2"(60pcs),5/8"(30pcs),3/4"(10pcs),length: 1.81 inch, total 200 pcs.7 diameters of Electrical Shrink Wrap Tubin for you to choose, all packed in a plastic box for easy store and carry.Our Wire Shrink Wrap Tubing satisfied for your different need. WIDELY USED - Our Industrial Heat-Shrink Tubing suitable for wire connection, rust prevention and corrosion protection of solder joints, cable joints, protection and insulation processing of wire end, wiring harness. This heat shrinkable tube has good electrical insulation, corrosion resistance and high temperature resistance. SAFE & ECO-FRIENDLY - The heat shrink tube is made of polyolefin, which has excellent flame retardant, insulation, acid and alkali resistance, high temperature resistance, anti-aging, and durability. UL Certified and RoHS Compliant.Don't worry about it hurting your body and environment. 4:1 SHRINK RATIO - You just use a hair dryer or heat gun heat it evenly until it wrap the wire or connector tightly. It is a 4:1 heat shrink ratio and will shrink to the original 1/4. (Temperature of your heat gun is up to 212℉, then glue inside will soften and seal the connection.) DUAL WALL HEAT SHRINK TUBING - Outer wall provides abrasion resistance,more resistant to stretching and vibration than regular heat shrink, and has more tensile strength.With adhesive lined,When heat is applied, The adhesive in the inner lining will come out and seal more tightly, creating a waterproof and durable insulation, eliminating the problem of the 2:1 tube not shrinking tight enough. BAOHUA 200 PCS Heat Shrink Tubing.