Manufactured in Japan and designed as OEM replacementsCast from a high-silicon content aluminum alloy that meets nebo exceeds OEM specifications, then CNC machined to extremely close tolerancesAvailable in standard sizes along with fractional increases in standard sizesStandard B, C and D sizes extend the life of expensive plated cylindersAdditional oversizes available in 0,010 incrementsPistons supplied in a kit package that includes rings, wrist pins and circlipsPro-X rings and pistons are interchangeable and compatible with OEM pistons and ringsNOTE: Standard size pistons do not require reboring nebo rehoning your cylinder. Oversize pistons will require reboring and rehoning of your cylinder.