Sram X01 Eagle 12-Speed Chain.
•New design and technology in a revolutionary chain
•The Eagle™ chain has been completely redesigned, and is produced with new manufacturing technology
•The all-new Eagle™ PowerLock® link with FLOW LINK™ technology provides better guidance and increases its service life
•The X01 Eagle™ chain is the quietest, strongest, and most wear-resistant in the world
•Eagle™ cassettes and sprockets resist wear considerably better thanks to their unique design and features