Sram GX-EAGLE 12-Speed Chain Silver/BlackThe GX Eagle chain is designed with SRAM's Eagle geometry, the GX Eagle chain features solid pin construction, Eagle PowerLock and smooth, efficient shifting that you can count on every time out. All new Eagle PowerLock chain connector with FLOW LINK technology provides better chain guiding and increased longevity Unique features and design also provide significantly improved wear resistance on Eagle cassettes and rings