RetraxPRO Tonneau Cover 40231RetraxPRO bed covers have the same great benefits as the RetraxONE but are made with industrial strength aluminum, giving them the strength to support distributed loads of more than 500 pounds! The RetraxPRO features a limited lifetime warranty, meaning you'll never have to worry about your bed cover once you have it installed. Sealed For Life Bearings Mean Smooth, One Handed Operation, Sealed ball bearing rollers are mounted onto each section. This