The Beatrush Engine Roll Stopper is light weight, strong, and rigid. Made of aluminum alloy with urethane sleeve fitting. Shifting is improved due to the significant reduction of front-to-back movements while the engine is under on/off throttle conditions; furthermore, it improves throttle response. Another benefit, is increased shifter response, and eliminates the pesky grind during fast/hard shifting. Track tested for functionality by Beatrush of Japan.