Tires & wheels, assembled, glued (3.8" black wheels, Sledgehammer® tires, foam inserts) (2) Sledgehammer^® extreme-terrain tires provide maximum traction and control on variety of off-road surfaces. The Sledgehammer's open block tread design clears mud and debris for unmatched traction in loose surfaces. Tires come pre-mounted with foam inserts and glued to 3.8″ black 5-spoke wheels. TSM^®-rated for high-speed applications. Fits front or rear. (Requires 17 mm splined hex)