Features: 1. Suitable for electrical insulation, wire bundling, colour coding, mechanical protection, wire/cable joints, DIY, RC drones and daily repairs etc 2. Comes with 670pcs heat shrink tube assorted in plastic box, 6 colors( Yellow, Blue, Black, Green, Red,white), 12 Specifications , satisfied for your different needs. 3. Provides environmental protection and abrasion resistance for electrical operation 4. Select the appropriate tube, put it on the wire joint and heat it to make it shrink with an air heater. 5. Your perfect assist for convenient and safety of family. Specification: Condition: 100% New Item Type: Heat Shrinkable Tube Set Minimum Shrinkage Temp: +70 Full Shrinkage Temp: +110 maximum Operating Temperature: -55 to + 125 Tensile Strength: 10.4Mpa Dielectric Strength: 15 kV / mm Flammability: Flame Retardant Item Shape: Round/Flat Cutting Method: Scissors or sharp knife Material: Polyolefin Shrinkage Ratio: 2:1 (will shrink to 1/2 its supplied diameter) Operating Temperature: -55C to + 125C Length: Approx. 38mm / 1.5in Internal Diameter:1mm/1.5mm/2mm/2.5mm/3mm/3.5mm Length: Approx. 45mm / 1.8in Internal Diameter:4mm/5mm/6mm/7mm/10mm/13mm Package List: (Quantity - Internal Diameter - Single Length) 60pcs - 1.0mm - 38mm Red 60pcs - 1.5mm - 38mm Black 50pcs - 2.0mm - 38mm Yellow 50pcs - 2.0mm - 38mm Black 50pcs - 2.5mm - 38mm Red 50pcs - 2.5mm - 38mm Blue 45pcs - 3.0mm - 38mm Black 45pcs - 3.0mm - 38mm white 30pcs - 3.5mm - 38mm Green 30pcs - 3.5mm - 38mm Blue 40pcs - 4.0mm - 45mm Black 40pcs - 4.0mm - 45mm Red 30pcs - 5.0mm - 45mm Blue 25pcs - 6.0mm - 45mm Green 25pcs - 7.0mm - 45mm Blue 20pcs - 10.0mm - 45mm Black 20pcs - 13.0mm - 45mm white Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.