The item is a set of 150pcs heat-shrink tubing tubes in 8 different sizes colors, which are made of durable polyolefin material, and feature the shrinkage ratio of 2:1. The heat shrinkable tubings can load shrinkage temperature from 70°C to 110°C, and dielectric strength up to 15 kV/mm. With professional workmanship and durable to use, it is really a wonderful 2:1 heat shrink tubings kit for choice. Features - 150 pieces of the 2:1 polyolefin heat shrink tubing tubes in 8 different sizes in one set will be together. - ColorAssorted Color - Material: durable polyolefin. - 8 Different sizes: Supplied internal diameter: 2.0mm, 2.5mm, 3.5mm, 5.0mm, 6.0mm, 8.0mm, 10.0mm, 13.0mm minimum; Fully shrunk internal diameter: 1.0mm, 1.25mm, 1.75mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.5mm maximum. - and 2:1 Polyolefin Halogen-Free Heat Shrink Tubing Tubes. - Shrinkage Ratio: 2:1 (will maximum shrink to 1/2 its supplied diameter). - Minimum Shrinkage temperature: 70°C. - Full Shrinkage temp: 110°C (maximum). - Operating temperature: -55°C to +125°C. - Tensile strength: 10.4 Mpa. - Dielectric strength: 15 KV/mm. - Manufacture specification: ISO9001. - Flammability: - Approvals: UL Approved - Supplied format (round or flat): Product is supplied flat - Cutting method:Scissors or . Package list: 40 * 2.0mm x 30mm (Supplied internal diameter * Single length) Heat Shrink Tubing Tubes (Black & Red) 40 * 2.5mm x 60mm (Black & Red) 20 * 3.5mm x 60mm (Black & Red) 16 * 5.0mm x 60mm (Black & Red) 10 * 6.0mm x 60mm (Black & Red) 8 * 8.0mm x 100mm (Black & Red) 8 * 10.0mm x 100mm (Black & Red) 8 * 13.0mm x 100mm (Black & Red)