The GX Eagle Single Click shifter has been optimized for the specific demands of E-MTB, designed to help eliminate premature chain wear and chain breaking by limiting the pull lever to a single engagement. With Eagle Colorsystem, it comes in the GX master colorway to go with any cassette and chain color choice you might go with--from Black to Gold to Rainbow to all-new Copper. - E-MTB specific--limits the pull lever to a single engagement to help eliminate premature chain wear and chain breaking - Master GX Eagle group colorway to match all cassette and chain colors as part of Eagle Colorsystem