Also known as Shrink Tubing, Shrink, Shrinkable tubing, Heatshrink tubing and Shrinkable Sleeves: Heat shrink tubing is simply a thermoplastic polymer that was mechanically expanded when made, that when heated, will reduce in diameter to its original size, while maintaining its length. 3/64in. Heatshrink is widely used in automotive, medical, telecom, electrical, aerospace, and consumer goods. The shrink tubing we have is polyolefin and is designed to shrink in diameter by at least 2/1 (50%). Our Polyolefin 3/64in. Shrink tubing finds uses wire strain relief, friction protection, as insulation of fine wires used in micro electronics, modeling. 3/64in. is perfect for tiny component leads. Since 3/64in. Heatshrink is small, due care must be taken when applying heat. 3/64in. Shrink Tubing is available in Red, Blue, Yellow, Green, White, Violet, Clear and Black to make color coding leads easy.