This is a new in the package ring set  (complete set of rings for both (2) pistons) for the 1976 1977 Yamaha XS360 motorcycles.  If you are looking to replace your rings on your stock original size Yamaha piston, then this is the correct part for you.   This is a standard (STD.) ring set. Correct replacement for part # 1L9-11610-00.  For standard 66mm bore size. This has the 2 compression rings and the lower 3pc oil control ring, everything to get your piston compression back where it should be.  A great deal!   Get your old bike up and running again. We only sell the best!  Top-quality aftermarket item.  We also have the helpful complete engine gasket set and engine oil seal kit too in our store.