Features: Easy to use, you can use a lighter or hair dryer to shrink the shrink tube. OOTDTY Fast heat-shrinkage and strong insulation. Good insulation, flame-retardant and anti-corrosion. Protect the wires and prevent leakage of electricity. The wire sleeve tubing has a wide application, suitable for electrical insulation, cable bonding, and repairing wires, cables, pipes and electrical and electronic components and more. Specification: Material: PlasticColour: BlackDiameter: Approx. 2.0-13mm/0.08-0.51inchShrinkage Ratio: 2:1Package Includes: 30 Pcs 40x2.0mm 25 Pcs 40x2.5mm 20 Pcs 40x3.5mm20 Pcs 40x5.0mm 16 Pcs 80x7.0mm 8 Pcs 80x10mm 8 Pcs 85x13mmnote: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.