Hold-Zit™ straps are scientifically designed and made in the U.S.A. of EPDM (Ethylene Propylene Dieme Monomer) rubber for all-weather durability. Standard equipment on many trucks and trailers, they hold down tarps and other equipment. Reinforced ends help prevent hooks from pulling out. It's used in preference to SBR (Styrene Butadiene Rubber) because of excellent flexibility at low temperatures and resistance to ozone and aging. Hold-Zit™ straps come with a lifetime assurance.