2" x 3" 11 gauge steel mainframe. Electrostatic ally applied powder coat paint finish, metallic silver. Durable double stitched upholstery. Sealed bearing pivot points. Direct drive press system for accurate and effective weight resistance. Large pivoting footplate maintains correct foot position throughout range of motion. Dual self aligning 1 1/2" linear bearing seat carriage design easily adjusts to accommodate various foot positions. Fully adjustable back support for proper body alignment and comfort