WISECO REPLACEMENT RING SET. ØØYBØtypeØsets consist ofØTop Ring and Oil Ring. Ø Top Ring:ØStainless steel, gas nitrided barrel faced. Ø No second ring. Ø Oil Ring: 3-pieceØoil assembly; Stainless steelØflex-vent spacer,Ønitrided rails. Ø The ring type and bore size (in mm) is stamped on the dome of the piston. Ø Refer to this information to order the correct replacement rings. Ø Ring styles cannot be interchanged. ØPlease note: Only WISECO replacement ring sets may be used on WISECO pistons.