It might look normal from the outside, but the engineering inside this incredible new SRAM X01 Eagle HollowPin 12 Speed Chain design makes possible a gear range previously found only in 2-chainring drivetrains. And its also the biggest contributor to the Eagledrivetrains ultra-smooth, precise, durable and quiet performance. The Eaglechains links have a smooth radius, with no sharp edges or chamfers, which yield a significant reduction in noise, friction and wear on chainrings and cassette cogs. This design also allows for a flatter plate, which means more consistent chain riveting and greater overall strength. HARD CHROMEtechnology extends the chains optimal performance life.Groundbreaking new chain design and technologyThe Eaglechain has been completely re-engineered, and is produced with new manufacturing technologyAll-new EaglePowerLock® chain connector with FLOW LINKtechnology gives better chain-guiding and increased longevityThe Eaglechain is the quietest, strong