KEEPER? engineered an EPDM rubber compound to take rubber straps to the next level of strength and durability. Unlike straps manufactured from cheap, inferior rubber, these straps will not crack, rot or lose rebound qualities, even if used infrequently. This rubber remains non-brittle in temperatures as low as -40 deg F and is not damaged by sunlight, ozone or demanding weather. Tough zinc-plated, steel hooks resist corrosion and do not bend, break or rust as easily as other straps, making KEEPER? EPDM rubber straps the excellent choice whenever you need a reliable strap.