Made out of stiff 7075 T6 aluminum, stamped, machined and then polished to a beautiful finish.
The Zen ring also features the SSGN super smooth tooth profile, which means the tooth valleys are rounder and the side tooth profile is smoother than the standard Sugino 75 SSG ring.
This slightly more expensive process helps reduces chain noise and also improves ring and chain engagement and wear.
These are not NJS-certified, since they are 3/32".
This is the hard to find 3/32" version (do not run 1/8" track chains with this)