The Impact Trolley is the only zip line trolley on the market engineered specifically for impact braking. It was designed to solve two major problems that are prevalent with many competitors' brake trolleys: Other trolleys produce unnecessary wear on the cable (causing you to replace the cable more often). With other trolleys, riders are stopped with an abrupt impact that causes greater swing, placing them at risk for injury. Every component of the Impact Trolley was engineered for maximum performance and effectiveness. The front of the trolley is designed with a slight curve that ensures smooth contact with the cable at all times. Both sheaves stay on the cable at all times, removing the risk of cable wear. Contact between the trolley and bumper is efficient so your riders stop like they are supposed to, but with the smoothest braking possible.