Piston Ring Set for Wiseco, CP Pistons, JE pistons, Arias pistons thickness 1mm - 1.2mm - 2.8mm rings Complete ring set for 4 pistons. Includes top rings, 2nd rings, and oil rings. Japan made. High quality replacement. Fit newer Wiseco pistons, CP pistons, JE pistons, and Arias pistons with the following ring thicknesses Top ring: 1mm / 0.039" thick Alloy steel, Ferrox coated, and Chrome faced 2nd ring: 1.2mm / 0.047" thick Cast iron, phosphate coated, and taper faced Oil ring: 2.8mm / 0.110" thick 3 piece assembly, stainless steel flex vent spacer, and chrome faced rails.