X-Fusion are LED bulbs that change from once color to the next slowly. For each color change it is smooth and there are no breaks between the shifts. These are great for thumbs, palms. and top of palms. Easily change up the look of your lights by purchasing new colored led bulbs. You can purchase the LED bulbs by themselves or have us install it into a rave light. If you would like us to install it into a housing with brand new batteries please select it from the options.