With Eagle Transmission being the first of its kind fully integrated and interdependent system the X0 Eagle Transmission (T-Type) Flattop Chain is so much more than just a chain. Its unique flat top design makes it the strongest chain SRAM has ever made. It features a Dark Polar finish specific to X0 has been plated with electroless nickel and comes with a PVD coating for unbelievable resistance to corrosion and wear.