WISECO Pro-Lite pistons are the result of technology chasing performance. Extensive research and development test programs and advanced manufacturing techniques keep WISECO ahead of the competition with proven dependability. * Individual pistons sold complete with rings, wrist pin, and circlips. * For racers and professional engine builders we now offer Racer's Choice series factory racing style pistons for some applications. Please note: The P-series part numbers for WISECO pistons have been replaced with the M-series number system. These numbers may also be found on the piston dome for reference along with the ring type code.