This is a very helpful item:  a new piston rings set for the CB900 Honda Motorcycles. For this price you will get all 4 piston rings...so enough to rebuild 1 engine.     This is correct for the 1979 1980, 1981 and 1982 models. Some people may also have CB900's registered as 1983 models too. If you bike is a 1983 it was likely a 1982 model sold in 1983. This is a correct also for the CB900C Custom models and the CB900F Super Sport models. Great bikes!  Very helpful if you are riding, touring or  restoring one of these now vintage Honda Motorcycles.  These are a standard size ring set 64.5mm .   This has the 2 compression rings and the lower oil control rings.. everything to get your pistons/ engine running nicely again.   Correct replacement for Honda part # 13011-438-004. 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 AHRMA racing these cool bikes.  That is it! Good Luck! If you are buying other items ask me about combined shipping savings before we invoice as we can often work that out.  Thank you!