These pistons grace the most powerful all motor, gasoline and alcohol powered sport compact engines on the planet! Race spec pistons feature aluminum wrist pin buttons, ceramic coated domes, moly coated skirts, flow bench designed high compression domes, and can be configured for 2 and 3 ring designs. Shelf units incorporate pin locks. Bisimoto Spec forged pistons are manufactured exclusively by Arias Pistons, with compressions ranging from9 to an astonishing 17.0:1. These specialty pistons can accomodate up to 3mm oversize valves and strategically lightened to provide optimal weight savings without compromising strength intergrity. Gains exceeding 8% have been documented with this piston technology in comparison to competitor shelf units. Serious inquiries only.