Wiseco 4466M07300 73.00mm 10.5:1 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 +6.00cc domed piston 2874XC ring set 250cc