I haven't bought any piston rings for a 4 stroke in a while..Overhauling a 153CID Chev inline four from a boat..The perfect Circle ring set I got is interesting...The box says made all around the place some in USA (where the hell is that??)...India...Argentina....Brazil...some place in the South Pacific etc...The box has the usual three compartments seperating the rings by groove...All the rings for the top groove are marked right...The ones for the second groove have two marked wrong and two right..The oil rings seem OK....Yeah I know it could be just a mistake but the point is I find parts like this all the time that don't match made is so many places...Hard to understand why they make one ring each in eight different place across the world...NAFTA..Bah!!!!.....The last 153 I overhauled ..number two rod shell wouldn't fit because the old one had been ground on the end to fit because the rod cap was made wrong...The engine was made south of the border so that explains that......Al...