The Box Three shifter combines performance and value at an affordable price point. It makes good use of nylon composites in both top and bottom shells as well as the levers. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up.Multi-shift lever allows you to pull several gears at once (up to 3 per shift)Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift throughFeatures a resin top shell and extruded clampFast action leverItem SpecificationsColorMatte BlackDrivetrain Speeds9Rear Der/Shifter CompatibilityBOX Prime 9Shifter StyleThumbWeight128 BOX Three Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097327