FEATURING: A carbon steel frame, a seat and back with heavy-duty inner liner, and urethane rear tires mounted on "no flex" wheels, the Tracer SX5 Wheelchair is built to last. BUILT TO LAST: Built with 14-gauge cross braces for added durability and strength. Seats are made of comfortable. dual-embossed nylon with heavy-duty inner liners that keep the seat and back from stretching. WEIGHT CAPACITY: 300 lbs. SEAT SIZE: 13X12 IN.