This is a new in the package Piston Rings set (1 set for each piston..so this is enough rings to do all 4 pistons) for the 1971 1972 1973 Honda CB500 Four Cylinder motorcycles.   This is a standard size (STD) ring set.  This has the 2 compression rings and the lower oil control ring for all 4  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. #13011-323-014.  Good stuff if you are riding or restoring or AHRMA racing these cool bikes.