This is a set of  2 complete .25mm Oversize piston rings sets (64.25mm).  So enough for 1 complete engine.  This is a new in the package Piston Ring set (1 set for each piston) for the  1969 1970 1971 1972 1973 Honda CB350 CL350 Scrambler, and SL350 Hondas. These were the great twin cylinder, four-stroke Honda. This is a .25mm oversize piston ring set correct replacement for Honda  #13021-287-010.  This has the 2 compression rings and the lower oil control rings for both pistons, everything to get your pistons/ engine running nicely again.   Get your old bike up and running again. We only sell the best! This is a top-quality aftermarket item shipped new in the package. Good stuff if you are riding or restoring or AHRMA racing these cool bikes.