Was $5.06 NOW $2.50 each. Medium insulated red polyolefin tubing, 3:1 shrink ratio. Dual wall shrink tubing is flexible and flame retardant and provides excellent protection from fluids, moisture and corrosion and is useful for outdoor, automotive and marine applications. The inner tubing wall is a modified polyimide adhesive that melts and flows, encapsulating and sealing components contained within the shrink tube. 4' length.