Commercial grade dual use strength range from impulse impulse sterling is the official supplier for the chinese national weight lifting team the impulse dual use leg extension leg curl is perfect for every commercial environment this is because it have a large selection of weights and the sligh designed allows it to fit in well with a large number of other products warranty of the impulse dual use leg extension leg curl 5 years on frame 1 year on moving parts 90 days on upholstery cables and