Leg Extension L100 Specifications: Size: 54"(W) x 44"(L) x 62"(H) Stack Weight: 140 lbs. (12x5lb, 8x10lb) Shipping Weight: 335 lbs. Target Muscle Groups - Quadriceps Features: Counter-balanced biomechanical cam Variable weight stack Seat adjustment Adjustable ankle roller Adjustable Roller Assembly Angled Seat Kevlar Drive Belts for Longer Life and Smoother Performance Lumbar Support Pad Molded Feet for Floor Protection Protective Weight Stack Shields Side-Stack Design Solid One-piece Frame Construction comprised of 2x3" and 2x2" tubing Variable Resistance Cam