BOX One Prime 9 Single Shift Shifter - 9-Speed, BlackBOX's top of the line 9 speed shifter comes packed with features such as a hinged clamp and a durable cast aluminum pull lever and top shell. All Prime 9 shifters take advantage of the 9 speed's inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your