This is a very helpful and essential and item if you are restoring or riding a 1981 1982 1983 Yamaha XJ750 four cylinder motorcycle.  This is for 4 full sets of rings (...so enough for  you or your mechanic to complete 1 engine).  These are Standard (STD.) 65mm size. Correct replacement for part #5G2-11610-00-00. These are for the stock standard size Yamaha pistons.  Perfect fitment. No disappointments here, we only sell the best! Top quality aftermarket item.  Get your bike up and running nicely again. These sure are fast, fun bikes eh?    We also have complete engine gasket set for this bike. We look forward to doing business with you!