Features 1、Made of wtt material, anti‑aging, not easy to break, long service life, large quantity, long‑term use 2、Mainly used for rust and corrosion prevention of solder joints in industries and ships, and surface protection of steel structures, etc. 3、Has the advantages of good electrical insulation, good sealing, corrosion resistance, high temperature resistance, etc. 4、Comes with a free plastic box to keep your heat shrink tubing kit in order, easy to store and retrieve 5、The heat shrinkable tube kit has three colors, very suitable for wiring harness identification and clear at a glance Specification Item Type: Heat Shrink Tubing Material: Wtt Uses: Suitable for Electrical Insulation, Wire Bundling, Color Coding, Mechanical Protection, Wire/Cable Joints and Daily Maintenance, etc. Package List 30 x Black Heat Shrink Tubing (45 x 13mm) 30 x Black Heat Shrink Tubing (45 x 10mm) 30 x Black Heat Shrink Tubing (45 x 7mm) 30 x Black Heat Shrink Tubing (45 x 6mm) 30 x Red Heat Shrink Tubing (45 x 5mm) 40 x Red Heat Shrink Tubing (45 x 4mm) 50 x Red Heat Shrink Tubing (45 x 3.5mm) 60 x Red Heat Shrink Tubing (45 x 3mm) 70 x Yellow Heat Shrink Tubing (45 x 2.5mm) 100 x Yellow Heat Shrink Tubing (45 x 2mm) 150 x Yellow Heat Shrink Tubing (45 x 1.5mm) 180 x Yellow Heat Shrink Tubing (45 x 1mm)