XX type sets consist of Top Ring, Compression Ring, and Oil Ring
Top Ring: Stainless steel, gas intrided barrell faced
Compression Ring: Cast iron, phosphate coated, taper-faced under hook
Oil Ring: 3-piece oil assembly; Stainless steel flex-vent spacer, nitrided rails
The ring type and bore size (in mm) is stamped on the dome of the piston
Refer to this information to order the correct replacement rings
Ring styles cannot be interchanged
Please note: Only WISECO replacement ring sets may be used on WISECO pistons