All Wiseco Piston ring sets fit JE Piston's with the same specifications, and the XG series piston rings share the following specifications: Top ring is 1.0mm thick alloy steel, ferrox coated, and chrome faced. 2nd ring is 1.0mm nodular iron, phosphate coated and taper faced. Oil ring is 2.0mm thick and a 3 piece assembly - stainless steel flex vent spacer, with chrome faced rails. Please contact us to verify your requirements if you have any questions. You must order 1 set per piston times the number of pistons in your motor. Proper end gaps may need to be set before installation.