Shimano Tourney SL-TX30 Thumb Gear Shifter Levers for MTB with Inner Cables 3x6speed Shimano Tourney SL-TX30 3X7Speed Thumb Gear Shifter Lever 3 x 7 speed, For 7 speed indexed SIS shifting Caliber: 22.2 mm. With stainless inner cables Material: Plastic and metal; Optical gear display Fit for Folding/Mountain/Road Bike and so on