Features： 1、Wide Applications: Heat shrinkable tubing is often used for solder joint protection, wire group marking, resistance and capacitance protection, etc. 2、Simple Operation: The operation is simple, just connect the heat shrinkable tube to the wire and heat it, and it can still be bent at will after heat shrinking. 3、Polyolefin Material: Made of polyolefin materials, which has good insulation and corrosion resistance, is safer to use. 4、Multiple Sizes and Colors: The kit contains heat shrink tubing of various sizes and colors, suitable for different maintenance needs. 5、With Storage Box: Includes a storage box with compartments for easy organization and storage of these heat shrinkable tubes, easy to use and replace. Specification： Item Type: Heat Shrink Tubing Kit Material: Polyolefin Length: Approx. 38mm / 1.5in, 45mm / 1.8in Working Temperature: -55℃~+125℃ Shrinkage Ratio: 2:1 Uses: Suitable for electrical insulation, wire bundling, mechanical protection, cable joints and daily maintenance, etc. Package List： 80 x 1x38mm Black Tube 80 x 1.5x38mm Yellow Tube 50 x 2x38mm Blue Tube 50 x 2x38mm Black Tube 30 x 2.5x38mm Black Tube 30 x 3x38mm Green Tube 30 x 3x38mm Transparent Tube 30 x 3.5x38mm Black Tube 40 x 4x45mm Black Tube 30 x 4x45mm Red Tube 30 x 5x45mm Black Tube 20 x 6x45mm Yellow Tube 20 x 8x45mm Red Tube 20 x 10x45mm Blue Tube 20 x 10x45mm Black Tube 20 x 10x45mm Transparent Tube