3:1 Shrinkage: Sanuke heat shrink tubing recovers up to 1/3 of its original diameter and seals tightly, solving the problem of many 2:1 shrink tubes that don't shrink enough and therefore don't seal tightly enough. Lower shrinkage temperatures and easy connection in seconds. Effective Seal: Adhesive on the inside. When heated, the adhesive oozes out and seals the joint, creating a waterproof, long-lasting insulator. Versatile Sizes: Available in 7 of our most popular diameters, ranging from 3/32" to 3/4". Shrink tubing is pre-cut to 3.54 inches. Dual Wall Tubing: The outer wall of heat shrink tubing has strong abrasion and corrosion resistance, and the inner wall provides waterproof sealing and strain relief, which better extends the service life of the heat shrink tubing. Wide Application: Our waterproof shrink tubing can be used in marine and automotive wiring, model building, DIY electrical wiring projects and electrical insulation/environmental sealing to protect surfaces against abrasion, peeling and denting and against moisture, fuel and chemicals.