Replacement Trolley Handles come fully assembled with comfort grips, a seat attachment and Finger Safe guards at the top with the Zip Line Fun logo. The Finger Safe guard will help keep fingers away from the moving trolley on the zip line. All trolley handles can accommodate up to a 5/32″ (4mm) cable and have a breaking strength of 2200 lbs, with the exception of the black Carbon Fiber Trolley that has a breaking strength of 3300 lbs. (50% stronger)!