Product Features Dual-walled Design: Polyolefin tubing outside and hot melt rings inside effectively improve waterproof performance and prevent wire corrosion. Easy Operation: Shrink Ratio 3:1. NO Crimping Needed. Transparent sleeve provides precise inspection when strip and insert wires inside. Color-coded tubing makes it easy for you to pick up for use. Durable Connection: Tubing reduces in size and solder will melt and flow through the stripped wires, ensure strong holding. Your wire will never slip out of the connector. Wide Applications: Ideal used for vehicle, motorcycle, boat, DIY electrical wirings and other outdoor applications.