BOX'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 set-up. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes).Multi shift shifter pulls up to 3 gears per shift. Multi shift shifter is not intended for use with eBikes. Engineered with Prime 9 drivetrain technology. Lightweight hinged and machined clamp. 1-piece pull lever. Fast action.