Description: One easy step to connection of wires, soldered, insulated and sealed. Excellent waterproof sealing and protection from mechanical damage combined with anti-corrosion effect. Polyolefin tubing in outside and hot melt adhesive in inside Polyolefin heat shrink butt connectors improved pullout strength, provides seal, strain relief, cable check, and insulation. Widely use in marine and automobile applications, solder and seal and with advanced waterproof function. Specification: Material : Tinned Copper Color : Red, Blue, White, Yellow Size: Red: 22-18AWG(0.5-0.1mm), diameter 3.0mm White: 26-24AWG(0.25-0.34mm), diameter 1.5mm Yellow: 10-6AWG(4.0-6.0mm), diameter 6.0 mm Blue: 16-14AWG(1.5-2.5mm), diameter 5mm Solder start melting temperature: 125? Solder complete melting temperature: 150? Completely shrink temperature: 130? Working temperature: -55? to 125? Comes in a plastic case Package Includes: 30 Pieces Blue 40 Pieces Red 20 Pieces White 10 Pieces Yellow Note: The color may be different for different display, pls understand Pls allow 1-3mm error due to hand test, thank you