Model Number : W05830328 pcs Heat Shrink Tubing 2:1, Waterproof Electrical Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube KitSpecially designed to be used in electrical systems to repair, insulate and add strength to wiring.Tubes shrink to half their diameter when heated to provide a secure seal.Supplied Inner Diameter: 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm.Length: 40mm / 1.6", 80mm / 3.1".Includes 328 pcs 2:1 Heat Shrink Tubing.Package Contents:120pcs * 1.0 * 40mm (Yellow, Black, Red, Green)60pcs * 2.0 * 40mm (Yellow, Black, Red, Blue)40pcs * 3.0 * 40mm (Yellow, Black, Red, Green)32pcs * 4.0 * 40mm (Yellow, Black, Red, Blue)24pcs * 6.0 * 40mm (Yellow, Black, Red, Green)20pcs * 8.0 * 80mm (Yellow, Black, Red, Blue)16pcs * 10.0 * 80mm (Yellow, Black, Red, Green)16pcs * 14.0 * 80mm (Yellow, Black, Red, Blue)How to use?Select the proper size.Insert the wires to the heat shrink tubing.Use the heat gun or lighter to shrink the tube.Don’t touch the tube until it is cool completely.Note: Keep about 1/2 inch distance when using the lighter to shrink the tube, or it may leave a black mark on the tube.Specification:Material: Irradiation cross-linked polyolefinShrinkage Ratio: 2:1 ( will maximum shrink to 1 / 2 of its supplied diameter )Minimum Shrinkage Temp: +70°CFull Shrinkage Temp: +110°C maximumOperating Temperature: -55°C to + 125°CItem Shape: Round/FlatSupplied internal diameter: 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm.