Hastings rings were chosen for this engine. "It's not necessarily a quality thing in this case. I researched the different ring diameters out there, and this Hastings ring is actually for a Subaru. It's thin, light, and the right size for my bore. If other engine builders fail to look at import listings on aftermarket parts, they are missing out on a wide selection of well-engineered parts." says Beck. The stock-replacement import parts are often less-expensive than comparable "custom" aftermarket parts in these special sizes. There's a tip for those of us looking at oddball bore sizes!