The Hammer is a sport wheelchair designed for use by individuals with lower extremity, mobility, or neurological disabilities or spinal cord injury. This wheelchair has a wide front-end "hammer-head" made of aluminum tubing that can be used for offense or defense in contact sports such as rugby, hockey, football, and softball. FRAME: The "Hammer" is constructed of aerospace drawn tubing. Anti-tippers are included. The frame is available in a choice of over 20 solid colors, raw (unpainted aluminum), or with holographic black stars. Optional features include "wings", integrated push handles (available only with fixed backrest height); a custom wheelie bar with caster; and black leather frame protector. SEAT (LxW): Choice of 12 to 18 x 13 to 18 inches. The front seat height is a choice of 15.5 to 21 inches, and the rear seat height is a choice of 13 to 21 inches. Positioning straps are available with Velcro on one or both ends. The backrest is available with an adjustable height range of 9 to 12 or 13 to 15 inches or with a fixed height of 8, 16, 17, or 18 inches, in a choice of folding or locking types (both are angle-adjustable). An adjustable tension backrest is also available. Also available are welded side guards or rigid side guards (choice of removable black ABS plastic or non-removable polished aluminum). CUSHION: 1-, 2-, 3- or 4-inch foam cushion with nylon cover, or 3-inch Curve Cushion from the Rehab Co. UPHOLSTERY: Black, red, or blue upholstery. Folding and locking backrests are available with leather trim; adjustable tension backrest is available with black upholstery only. CASTERS: 3-inch turbo casters in clear, red, or black. WHEELS: Options include 24-inch radial spoke wheels with high press black wall tires or low press tires; 24-, 25- or 26-inch heat-treated wheels; 24-, 25- or 26-inch Twister Super Strength wheels; and 24-, 25- or 26-inch, 24-spoke Spinergy Sport wheels with black, yellow, blue, or red spokes. Choice of anodized gray, black powder-coated, or black plastic-coated handrims. Other options include quad wheel quick release and black spoke protectors. One-piece axle tube with a 8-, 10-, 12-, 14-, or 16-degree camber disc. Rear axles have quick release and front axles have fixed bolts.