This might look like an ordinary chain but it isnt. The Sram XX1 Eagle Chain is a feat of engineering that makes a range of gears possible in a 1x set-up that was previously locked into 2x systems. The biggest contributor to the Eagles smooth, precise, & durable performance, the XX1 Eagle Chain links feature a smooth radius, with no sharp edges or chamfers to yeild a reduction in noise, friction, & wear on chainrings & cassettes. Hard Chrome technology expands the chains optimal performance life while a Titanium Nitride coating decreases corrision & friction for long life. Description by Mark, Rutland Cycling Web Team.