Sram pcxx1 eagle 12 speed chainthe top of the line sram pc xx1 eagle 12 speed chain boasts a ground breaking design that encompasses the very best of srams technologies construction and materials sram have produced the quietest strongest and most wear resistant chain on the market as it is manufactured from srams hard chrome material this chain has a durability that is four times the current standards of srams other chains it provides ultimate performance by using flow link technology