NEW SRAM RED Flattop Chain - 12-Speed, 126 Links, Flattop, PowerLock, Rainbow, E1 SRAM took the lightest and most durable chain they’ve ever made and made it lighter. With no compromises. Their HollowPin construction is lighter and stronger than a solid pin, and cutouts in the outer and inner plates drop 13g from the previous generation. This results in a lighter, faster, stronger and more durable chain.Flattop technology enables a narrower chain with quieter operation and increased strength and durabilityHard Chrome plated inner link plates and rollers for reduced wear and prolonged lifeHollowPin construction for increased strength and efficiencySuper-light outer and inner plates with cut-out design13g lighter than previous RED chain