Back Extension L128 Specifications: Size: 48"(W) x 36"(L) x 62"(H) Stack Weight: 175 lbs. (15x5lb, 10x10lb) Shipping Weight: 335 lbs. Target Muscle Groups - Back Features: Biomechanical cam Adjustable foot platform Variable weight stack Vertical back adjustment Safety seatbelt Angled Seat Instructional Placard Kevlar Drive Belt for Longer Life & Smoother Performance Molded Feet for Floor Protection Protective Weight Stack Shield Side-Stack Design Solid One-piece Frame Construction comprised of 2x3" and 2x2" tubing Superior Grade Foam and Mildew-resistant Naugahyde Variable Resistance Cam