Heat shrink tubing is a coating material used for protection, antifouling, etc. of rolls and cables and their surroundings. Heat it with an industrial dryer or hot air gun, cover it, shrink it, and fix it. Appropriate temperature, procedure, precautions, etc. when shrinking are different for each product, so prior confirmation is required. It is also important to check the inner diameter before and after shrinking when selecting a product. Many products have excellent durability, chemical resistance, heat resistance, electrical characteristics, etc., and protect the surface of covered objects from heat, dirt, static electricity, etc. Most products are made of fluoropolymer and have excellent flame retardancy and insulation properties due to the properties of the material. Some products are recommended to be kept away from high temperatures if they are not used immediately after purchase to maintain the inner diameter before shrinkage.