This machine features a more stable base which prohibits the frequent twisting common to other sleds. Exclusively shaped Urethane rollers incorporate sealedbearings which provide and ultra-smooth stroke. Longer weight posts allow for extra capacity. Leading Design Using 6 Urethane Rollers incorporating Sealed Bearings Easily converts from Hack Squat to Leg Press or Power Thrust Features Dual Heavy Triangular Frame Producing the Most Stable & Strong Machine in the Industry Ergonomically Angled Shoulder Supports Multi-Position Stop Locks for Safety & Ease of Use Heavy Duty Anti-Skid Foot Plate Extra Wide Back Pad Accepts Olympic Plates Only Built-in Olympic Plate Storage Weighs 400lbs. 78" L x 72" H x 57" W