Vktech 150Pcs 2:1 Polyolefin Halogen-Free Heat Shrink Tubing Tube 2-13mm 8 Sizes Supplied internal diameter: 2.0mm,2.5mm,3.5mm,5.0mm,6.0mm ,8.0mm,10.0mm,13.0mm minimum, Color: Red, black Material: Polyolefin Manufacture specification: ISO9001 Cutting method: Scissors or sharp knife