The Sram X.0 Twister shifters are the lightest and have the fastest shifting capability ever designed with an incredible race pedigree. Need both weight reduction and shifting distinction this is the only choice that has been 20 years in the making. Superior 1:1 Actuation Ratio and SRS Technology. The lightest shifter available. Designed with Multiple Shift Capability and integrated Quick View Gear Indication. 10 speed compatible with Sram 1:1 rear derailleurs Sram or Shimano front derailleurs. Lightweight Grilon body and Krayton Grip. 195 grams / pair.