FREE SHIPPING-4 FOOT ROLL of 3/8" Clear 3:1 Shrink Ratio POLYOLEFIN heat shrink tubing. Dual wall, Adhesive Lined. Really nice tubing. Shrinks from 3/8" inside diameter down to 1/8" inside diameter. With the glue it shrinks to about 1/16" inside diameter. Completely waterproof. This is great stuff for marine use and fits a huge variety of gauge wire and multiple wire connections.