[Large collection of electric wires]: 5 colors (black, yellow, blue, green, red), 12 specifications, 750 pieces. [12 heat shrink tubes. length]: 45mm; diameter: 1mm/1.5mm/2mm/2.5mm/3mm/3.5mm/4mm/5mm/6mm/7mm/10mm/13mm. [Shrink Ratio Heat Shrink Fittings]: 2:1. Excellent flame retardant and insulating performance. Soft and flexible, low shrinkage temperature, fast shrinkage, acid and alkali resistance, anti-aging. Color heat shrink sleeve insulation heat shrink combination Material: Polyolefin Withstand voltage: 1KV Temperature resistance: -55-125 () Size: 195 * 132 * 35mm The shrinkage ratio is approximately 2:1 Features: Good insulation, low smoke, temperature and voltage resistance, flame retardant and anti-corrosion, soft and elastic Scope of application: Data line protection, solder joint and insulation protection, electronic components, wire DlY, terminal insulation, metal rod protection, circuit number line, etc