Harmless to Health: The material composition of heat shrink tubing does not contain materials such as PBBE, PBBO, PBB, etc. Black heat shrink tubing 2: 1: The heat shrinkable cable sleeve has excellent flame retardant and insulating properties. The heat shrink tubing shrinks quickly and the shrink temperature is low. Soft and flexible, fast shrinking, acid and alkali resistance, anti-aging. 650PCS Heat Shrink Tubing Kit with 8 Sizes: There are 650pcs black heat shrink tubes in the transparent box. Inner diameter supplied: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm. Wide Application: Heat Shrink Tubing covers the gauges of wire youll need for RC hobbies and many other applications. Effective for insulating or protecting cables in industry or at home, also useful for repairing injured sheath. Also an ideal gift for your father and mother on Thanksgiving Day, Christmas Wide Use: Covers all wire specifications required in a wide range of applications. It is mainly used in wire connections, corrosion protection and rust protection of solder joints, protection and insulation of electronic components of line segment and wire harness. Delivery quantity: 1 piece (650 heat shrink tubes included)