Mahle MS Piston Set 100mmMahle PowerPak piston and ring kits include forged pistons, low drag rings, steel pins, and wire locksall in one race proven package. The pistons are hand deburred and then coated with dry phosphate to protect against ring micro welding and pin galling during initial startup. For additional performance, Mahle added its proprietary Grafal anti friction coating to the piston skirts. These replacement packages are available in a wide variety of size