- Pistons for plated cylinders come in standard size, as well as in A, B, C, D+ oversize's - Pistons for sleeved cylinders are available in standard size and a wide range of oversize's - Uses the same low-expansion, low-friction piston alloy as used for all major Japanese engine manufacturers - Precision machined on the latest, state of the art CNC equipment - All ProX piston kits are supplied complete with pistons, piston rings, wrist pin and circlips, ready to install