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X11 Features: Dimensions: 1/2" x 11/128" Pin Length: 5.65mm Half-nickel plated Extremely durable 118 links Weight: 278g X11EL Silver 1/2" X 11/128" Pin Length: 5.65 mm 118 Links Weight: Extra Light, 252 grams Color: Silver Top-Performance Double X-Durability Non Directional Nickel Plated For Shimano, Campagnolo and SRAM 11-speed derailleur systems X11SL Silver 1/2" X 11/128" Pin Length: 5.65 mm 118 Links Weight: Super Light, 237 grams Color: Silver Top-Performance Double X-Durability Non Directional Nickel Plated For Shimano, Campagnolo and SRAM 11-speed derailleur systems X11EL Gold 1/2" X 11/128" Pin Length: 5.65 mm 118 Links Weight: Extra Light, 252 grams Color: Gold Top-Performance Double X-Durability Non Directional Titanium Nitride Gold coated Compatibility: SHIMANO, Campagnolo and SRAM 11 speed drivetrain systems 1x11, 2x11, 3x11 Suitable For Down Hill, Mountain Bike, Road Bike, Cyclo-Cross X11SL Gold 1/2" X 11/128" Pin Length: 5.65 mm 118 Links Super light weight Color: Gold Top-Performance Double X-Durability Non Directional Titanium Nitride Gold coated Compatibility: SHIMANO, Campagnolo and SRAM 11 speed drivetrain systems 1x11, 2x11, 3x11 Suitable For Down Hill, Mountain Bike, Road Bike, Cyclo-Cross