Thin wall heat shrink tubing insulates, provides strain relief, and protects against mechanical damage and abrasion. They’re widely used for insulation and protection of components, terminals, wiring connectors and wiring strapping, marking and identification mechanical protection. The tubing comes in a wide range of sizes, colors, and materials. When heated, it shrinks to conform to the size and shape of the underlying material, making installation fast and easy. The  continuous operating temperature is suitable for Minus 55°C to 125°C. There is also a military-standard grade with a maximum working temperature of 135°C. Both 2:1 and 3:1 shrink ratio are fine.