Wrap-It Heavy-Duty Storage Straps are tough. Made with heavy-duty polypropylene, industrial strength hook and loop, plus a rust-resistant grommet these are built to last—indoors or out. NEW polypropylene material holds up well to outdoor elements and even floats. Industrial strength hook and loop holds up to 50 lbs (10"-28" sizes, 7" size holds up to 25 lbs). Rust-resistant metal grommet allows for easy hanging.