This is a new in the package standard (STD.) size Piston Ring Set  (this is for the pair pictured..so you get 1 complete set for each piston..so 2 sets) for the  1964 1965 1966, 1967, 1968, 1969. Honda CB160 CL160 Scrambler, CA160.    This is a standard size (STD) ring set that fit a stock standard size Honda piston ring.  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. This is a top-quality aftermarket. We only sell the best!