Chain Rt520R3-3 Gb 116C+Rh520 R33 ChainThis new chain design does away with the "O ring" and instead incorporates Renthal's SRS (Self Regulating Seals) ring system to increase chain longevity Chain has been upgraded to the R4 ranges proven quad riveting manufacturing process Rivet link has also been changed to a hollow end to facilitate easier installation that does not require a Quad Stake Rivet tool to install High carbon alloy steel pins, solid bushings and rollers, and