Product Feature 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. Product Specification Type 500PCS Solder Connectors ColorYellow, Blue, Red, White MaterialPolyolefin Tubing with Hot Melt Adhesive & Solder inside Measurement SystemMetric Special Features1 Step Solder and Seal Process Specification Met:?U Minimum Shrink Temperature 80?c, ? Minimum Temperature for Solder to Melt StyleSolder Seal Butt Connectors Package Included 110 x White Connectors: Diameter 1.7 mm Cable cross-section 0.25-0.34 mm2(A.W.G.:26-24). 150 x Blue Connectors: Diameter 4.5mm Cable cross-section 1.5-2.5 mm2 (A.W.G.:16-14); 200 x Red Connectors: Diameter 2.7 mm Cable cross-section 0.5-1.0 mm2 (A.W.G.:22-18); 40 x Yellow Connectors: Diameter 6.0 mm, Cable cross-section 4.0-6.0 mm2 (A.W.G.:12-10). s