Heat activated adhesive lining creates a superior water, oil, and acid resistant seal. Most shrink tubing on the market reduces to a 2:1 ratio, Ancor tubing shrinks to 3:1 which allows a wider range of applications for each tubing size. Specifications Color: Yellow Size: 1" x 48" Diameter: 1" Shrinks To: 1/4" Weight: 0.5 lbs