This is a new in the package Piston Ring set (1 set for all 4 pistons - enough for 1 complete engine) for the  1971 1972 1973 1974 1975 1976  Honda CB750 Four motorcycle.  These are a standard size ring set 61mm .   This has the 2 compression rings and the lower oil control rings.. everything to get your pistons/ engine running nicely again.   Get your old bike up and running again. This is correct for all of the CB750 F and CB750 K models and Super Sport models. This will not work on the 1976 CB750A model. We only sell the best! This is a top-quality aftermarket item shipped new in the package. Correct replacement for part # 13011-300-024. Good stuff if you are riding or restoring or AHRMA racing these cool bikes.  That is it!