High Quality: Compliance with all relevant European standards, thick barrel ensures strong crimp every time, your wire will never slip out of the connector. Waterproof: Heat-shrinkable tubing is insulated, sealed, and waterproof to prevent wire corrosion. It is convenient for ships, automobiles, electrical and electronics industries. Durable: Translucent heat shrinkable tube has high tensile strength and resistance to tensile and mechanical damage, strong insulation, resistance to wear and tear. Strong Conductivity: Tin-plated copper crimping tube can provide greater current to achieve the highest conductivity, and reduce the voltage to prevent wiring failure. Easy to Use: Different colors can easily mark coding and identify the correct size. Transparent Sleeve Provides Precise Inspection When Strip And Insert Wires Inside. Product Specifications: Material: Polyolefin + Copper Size: (L*D) Red: 3.8 X 0.6cm Blue: 3.8 X 0.7cm Yellow: 4.2 X 0.8cm Weight: 1.1g, 1.5g, 2.3g. Colors: Red, Blue, Yellow. Package Includes: Quantity: 100Pcs Red Heat Shrink Butt Connectors X 40Pcs Blue Heat Shrink Butt Connectors X 40Pcs Yellow Heat Shrink Butt Connectors X 20Pcs Plastic Storage Box X 1Pcs Connector color and cable size: Red Connectors: Suits Cable Wire Sizes 0.5-1.5mm / 22-16 AWG Blue Connectors: Suits Cable Wire Sizes 1.5-2.5mm / 16-14 AWG Yellow Connectors: Suits Cable Wire Sizes 4.0-6.0mm / 12-10 AWG Technical Specifications: Double-walled design hoses: Polyolefin hoses outside and hot melt adhesive Connector from a single piece of copper Heat-activated adhesive lining Operating temperature: -55125 Minimum shrink temperature: 80 Full recovery temperature: 130 Polyolefin Tube Shrink Ratio: 3 : 1