This is a new in the package Piston Ring set (1 set of rings for each piston) for the 1979 GS425 Suzuki.  This is a standard size (STD) ring set which is correct replacement for # 12140-45100. 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  racing these cool bikes.  That is it! Good Luck!