In-house designed and manufactured; all forgings are produced in Wssners company-owned forging operation 4-stroke pistons are made using a double-bridged forging design Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine Standard and oversize pistons for most models, with high compression ratios available for 4-stroke applications All piston skirts are supplied with a Moly coating to reduce friction and assist in break in All piston kits include piston, ring, wrist pin and pin locks Wssner piston kits are used by leading Supercross, Arenacross and MX GP teams