SRAM X01 11 Speed Chain: The X01 chain comes from a long line of tough, light-weight chains from SRAM. When every bit of torque counts, you can count on it to deliver. The SRAM X01 drivetrain carries on the tradition of SRAMs championship-winning 1X philosophy-all the way down the mountain. The setup is simpler. The drivetrain is lighter. & the shifting is fast & solid. Bottom line: X01 is the right one for any terrain, every time. The new 1X specific chain has HARD CHROME technology for maximum strength & wear resistance with proprietary link finish provides enhanced life span supplied with a 11-speed power lock quick link. Hard Chrome The XX1 Chain has 4 times the elongation (wear) resistance to our other chains. This is due to the new finishing process on the inner links & rollers. Push pin strength & ultimate strength are equivalent to our current chains. The XX1 Chain lasts longer & is just as strong. Technology: Hard Chrome Compatibility: 1 x 11-speed, 10-42 cassette Pin Treatment: Hollow Pin Recommended Group: X01, XX1 Weight: 252g