Ideal for creating a totally waterproof seal and dressing up your crimped or soldered terminals. This new 3:1 Shrink ratio tubing has a dual wall. The outer layer is Polyolefin and the inner wall is adhesive lined and melts with the shrink heating to provide a tight and waterproof seal. Temperature Range -67 to + 275 degrees Fahrenheit. All sizes are provided in 5" lengths. Available in black or red and in kits or refills.