A combination of user-friendly ergonomic design and advanced biomechanical engineering, the GSCR349 was created to increase calf muscle interaction and speed the rate of development.This is achieved by the use of a unique foot platform design that eliminates stress compression on the ball of the foot while providing maximum range of motion for deep muscle fiber penetration. The weight carriage provides a 3:1 weight-to-resistance ratio and pivots on precision pillow block and sealed ball bearingsfor smooth friction-free movement through heavy-duty calf-blasting workouts.In order to carry the heaviest loads, the main frame is constructed of 2″ x 3″ 11-gauge high-tensile strength steel, making the GSCR349 perfect for high traffic, heavy use gyms and clubs.Super-durable, full 3″ thick DuraFirmâ„¢ padding supplies the comfort even during workouts with enormous poundage. The Body-Solid Lifetime In-Home Warranty and Full Commercial Warranty back the best calf machine in the industry.Olympic Adapter Sleeves, weight plates, and collars optional