Wiseco 4716M10000 100.00mm 11:1 Compression Motorcycle Piston Kit Wiseco's forged pistons are tougher and more durable than cast pistons, and will stand up to the abuse that high performance motorsport applications require Piston kits contain one piston, rings, piston pin and piston pin circlips Domed piston 3937XS ring set 644cc