Descriptions:This heat shrink tube is best for wire connection, solder's joint protection, connectors sealing, group lines marking, resistance electric capacity insulation protection etc. Features: - Corrosion Resistance - Good Electrical Insulation - High-strength Toughness - High Temperature Resistant - Waterproof Resistant - Long Service Life How To Use: 1. CHOOSE THE RIGHT SIZE TUBE. Measure the diameter of wire/cable you want to wrap, make sure the diameter is equal to the size of heat shrink tube after shrinking, because the tube will shrink up to 1/2 of original diameter after heating. 2. WRAP THE WIRE WITH THE TUBE. Cut out the Long you need, wrap the wire with the tube, use a lighter, hair dryer or heat thing to heat the tube. 3. HEAT THE TUBE UNTIL THE WIRE IS WRAPPED TIGHTLY.