WISECO REPLACEMENT RING SET. ØØXH typeØsets consist ofØTop Ring, Compression Ring,Øand Oil Ring. Ø Top Ring:ØChrome faced high temperature steel alloy. Ø Compression Ring:ØTaper faced ductile iron. Ø Oil Ring: 3-pieceØlow tension oil ring. 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.