[No Harm to Health]: Lieberway's heat shrink tubing material composition does not contain PBBE, PBBO, PBB and other materials. No harmful gases are produced during hot extraction. [black heat shrink cable sleeve 2:1]: Heat shrink cable sleeve has excellent fire resistance and insulation properties. The heat shrinkable sleeve shrinks quickly and the shrinking temperature is low. Soft and flexible, shrink fast, acid and alkali resistance, anti-aging. [650PCS heat shrink tubing set, 8 specifications]: black heat shrink tubing in transparent box 650PCS supplied inner diameter: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm. [Wide Application]: Heat shrink tubing covers the wire gauge you need in hobbies and many other applications. Ideal for insulating or protecting industrial or domestic cables. It is also ideal for repairing damaged cable sheaths. Also an ideal gift for parents for Thanksgiving, Christmas Covers all wire specifications needed for a wide range of applications. Mainly used for corrosion and rust protection in wire connections, welds, protection and insulation of wire harness segments and electronic components. Note: Data is Manual measurements, please allow 1-43cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.