The Catalyst 4C is a lightweight folding adult manual wheelchair designed for use by individuals with lower extremity, mobility, or neurological disabilities or spinal cord injury. FRAME: The frame is constructed of 6061-T6 aircraft aluminum. It features an offset axle plate that offers rear seat height adjustability, and the axle plate can be reversed for amputees. A heavy duty frame (350 pounds capacity) and rear anti-tips are optional. The frame is available in a variety of colors in matte or gloss finish. SEAT (WxD): (16 or 18) x (14, 16 or 18) inches standard. Optional widths are 14, 15, 17, 19, 20, 21 and 22 inches; optional depths are 15, 17, 19 and 20 inches. Cross braces, standard or seating system, are standard. The front seat height is available from 13.5 to 21 inches, and the rear seat height is available from 12 to 20 inches, both in 0.5-inch increments. The back height is available from 8.5 to 19.5 inches. The back posts are available with or without push handles. Seat belts are optional. UPHOLSTERY: Standard back upholstery. Tension adjustable upholstery is optional. ARMRESTS: Flip back armrests or no armrests are standard; height adjustable t-arm or flip back armrests are available. BRAKES: Push to lock wheel locks are standard. Extension handles and grade aids are optional. CASTERS: Standard casters are available with diameters of 4, 5, 6, 7 and 8 inches; numerous options also available. WHEELS: 24-inch spoke or 20-, 22- or 24-inch mag wheels are standard. Various rear wheel types are available as options. Street pneumatic 1.38-inch rear tires are standard; other rear tire types are optional. Aluminum anodized handrims are standard; other handrim types are optional. FOOTRESTS: Swing-away footrests (60, 70, 80 or 90 degrees) are standard; elevating footrests are optional. All footrests are available in lengths of 4 to 21.5 inches in 0.5-inch increments. Composite footplate is standard. Aluminum and flip up footplates and heel loops are optional. ACCESSORIES: Tool kit, side guards, Ki Mobility backpack, black neoprene impact guards, clear spoke guards, black spoke guards, and cane and crutch holder. CAPACITY: 250 pounds; or 350 pounds (Heavy Duty Option). WEIGHT: 24 pounds.