Specially designed for mid engine driven e-bikes such as Bosch, Panasonic and AEG, These chains have higher TORSION resistance to cope with ruthless shifting and hi-torque Also compatible with all 9-speed road and MTB drive train systems Fit and forget with eco-proteq (epT) anti-rust technology, surpasses 650 hours salt spray test Triple x-durability, unmatched chain life- KMC guaranties your satisfaction Non-directional design: assembly of this chain is independent of direction. It allows maximum compatibility, no matter MTB or race: this chain fits all.Hi-torsion resistance & increased pin-power.Authenticated production. Awarded internationally & industry renowned.Extra long: 136 links.1/2" X 11/128" - pin length: 6.6 mm.Weight: 344 grams