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 won't crack, rot, or lose rebound qualities with repeated use. This rubber remains nonbrittle in temperatures as low as -40°F and will not damage in most demanding weather. Tough zinc plated, steel hooks resist corrosion and do not bend, break, or rust as easily as other straps, making KEEPER® EPDM RubberStraps the best choice whenever or wherever you need a reliable strap. All strap is measure from hook to hook.