The Non-Directional design allows maximum compatibility. The X-Bridge system on the outer plate is configured with precisely articulated angles for quicker and smoother gear shifting, and quieter riding.   Features This chain is compatible with 12x Campagnolo, Shimano and Sram MTB.  It is not compatible with Sram road groups, this is due to a difference in pin length.. Titanium Nitride (Gold) coated or Nickel Plated (Silver or Black and Gold). Includes non-reusable 12x Missing Link. Specification 126 Links. Double X Durability. Non-directional. Weight: 268g (126 links).