!This is a new in the package standard 0.50mm Oversize Piston Ring Set x 4 (this is for all 4 sets pictured..so you get 1 complete set for each piston..so 4 sets..enough for 1 engine) for the Honda GL1000  GL 1000 Goldwing  motorcycles that were made in 1975 1976 1977 1978 1979.   Standard bore is 72mm and this is for the .50mm (2nd oversize) Honda piston.  Perfect part of a restoration or freshen up of your tired motor.   This has the 2 compression rings and the 3pc 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. Correct for part #13031-371-013  Good stuff if you are riding or restoring one of these cool bikes.