I accidentally bought a duplicate, so I'm selling it. From the manufacturer: This is mainly used for long hours and long-distance cruising. It's incredibly easy to open the throttle just by resting your palm on it without gripping! Using the throttle allows you to easily operate the motorcycle throttle and reduce arm fatigue without putting pressure on the handlebars. Universal for motorcycles, electric bicycles, and kickboards with throttle handle diameters of 30mm-35mm (circumference 94mm-110mm). When installing, slowly widen the opening and then clamp it onto the throttle handle. Installation: First, apply force from the rolled-up inner apex to expand the rolled-up throttle booster to a size that can be attached to the throttle handle, and then clamp it on. Adjust the booster to a comfortable angle counterclockwise. Universal for motorcycles, electric vehicles, and scooters. This throttle assist helps on highways and during long cruises, relieving fatigue in your right hand during touring! Effective for long-distance touring! You can fix the throttle with your palm, reducing arm fatigue. This throttle assist helps on highways and during long cruises, relieving fatigue in your right hand during touring! *It is recommended to keep your palm away from the throttle assist when stopped. Due to its characteristic of activating even with light contact, please be careful to prevent malfunctions. Type of equipment: Other