The G2 Throttle Tamer helps YOU become a better rider! How? It uses a “progressive” (non-circular) ratio between throttle grip turn and power delivery. By changing the shape of the pulley, or “cam”, the Throttle Tamer gives you a huge improvement in control! Each Throttle Tamer’s progressive shape is proven to be the best all-round solution for each model. For most models, the cam size begins about 20% smaller that stock, then it ramps up to the stock size by about one-half throttle. The Throttle Tamer’s 20% smaller size requires slightly more turn at first, which makes a HUGE difference in control! As the power is rolled on, it's far easier to modulate traction! The cam size increases, or ramps up, after 1/2 throttle to keep overall rotation near stock rotation. Machined from 6061 aluminum in the U.S.A.!