This is a 17-inch Texas Twister engine driven fan blade, clockwise rotation, 8,000 RPM. - Constructed of a heavy-duty flexible blend of glass-filled nylon and thermoplastic elastomer - Maximum 8,000 RPM - Clockwise rotation - Economical cooling for any car with 4 bolt water pump pulley - Lightweight, for weight conscious racers - Lowest cost cooling solution in the market - Includes mounting washers Warning: Product may contain materials cautioned by California Proposition 65