Product_description: ['WISECO ProLite pistons are the result of technology chasingperformance. Extensive research and development test programsand advanced manufacturing techniques keep WISECO ahead of thecompetition with proven dependability. Individual pistons sold complete with rings, wrist pin, andcirclips. For racers and professional engine builders we now offerRacers Choice series factory racing style pistons for someapplications.Please note The Pseries part numbers for WISECO pistons havebeen replaced with the Mseries number system. These numbersmay also be found on the piston dome for reference along withthe ring type code.'] (Page 1)