Wossner is Germany\’s finest aftermarket forged piston and rod manufacturer and has over 25 years of experience in the high- performance racing industry. Top European racers and FIM World Champions rely on Wossner for only the best pistons, rods and customer service. Features In-house designed and manufactured; all forgings are produced in Wossner\’s company-owned forging operation. Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine. All pistons include piston, ring, wrist pin and pin locks. Wossner pistons are used by leading Supercross, Arenacross and MXGP teams. Made in Germany. Specifications: Bore Size: 47.50 Piston Size: 47.45 Ring Quantity Needed: 2