This is a new in the package Piston Rings set (1 set of rings for all 4  pistons!) for the 1982 1983 1984 1985 GS300L models.  This is a standard size (STD) ring set which is correct replacement for Standard bore pistons.   Correct replacement for #12140-34240.    Each of the ring sets has the 2 compression rings and the lower 3pc oil control rings for the 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.