SRAM CHAIN PC X01 EAGLE HOLLOWPIN 126 LINKS POWERLOCK 12 SPEED It might look normal from the outside but the engineering inside this incredible new chain design that makes possible a gear range previously found only in 2-chainring drivetrains. & it’s also the biggest contributor to the Eagle™ drivetrain’s ultra-smooth precise durable & quiet performance. The Eagle™ chain’s links have a smooth radius with no sharp edges or chamfers which yield a significant reduction in noise friction & wear on chainrings & cassette cogs. This design also allows for a flatter plate which means more consistent chain riveting & greater overall strength. HARD CHROME™ technology extends the chain’s optimal performance life & a Titanium Nitride coating on the Gold & Black models decreases corrosion & further reduces friction.