This is the SRAM PC-XX1 Eagle Chain. It might look normal from the outside, but the engineering inside this incredible chain design that makes possible a gear range previously found only in 2-chainring drivetrains. And it's also the biggest contributor to the Eagle drivetrain's ultra-smooth, precise, durable and quiet performance. The Eagle chain's links have a smooth radius, with no sharp edges or chamfers, which results in a significant reduction in noise, friction and wear on chainrings and cassette cogs. This design allows for a flatter plate, which means more consistent chain riveting and greater overall strength. Features: Groundbreaking chain design and technology The Eagle chain has been completely re-engineered, and is produced with new manufacturing technology. Eagle Power Lock chain connector with FLOWLINK technology provides better chain-guiding and increased longevity The Eagle chain is the quietest, strongest and most wear-resistant chain in the world Unique features and design also provide significantly improved wear resistance on Eagle cassettes and rings Product Specifications: Compat - Speed (CN) 12 Chain length (links) 126 links Chain connector PowerLock Inner link finish Chrome plated +PVD Outer link finish Nickel+PVD Pin variant Hollow Pin Chain Technology Eagle E-Bike Approved Yes Weight (g) 239 Weight Based On 114 links Vendor Item No: 00.2518.024.020 (Gold) 00.2518.024.021 (Black) 00.2518.039.010 (Multicolor) 00.2518.043.010 (Copper)