This is a dongle cover for the Finalmouse UltralightX. By adding a cover created with 3D CAD to the dongle, which is usually too light and doesn't stay in place, it improves the appearance and stabilizes it. Due to the filament, it's a slide-on shape instead of a snap-in shape. It's not as stable as a snap-in, but there are no problems in use. The price difference with other colors is due to the cost of the filament. Unlike a stand, it's designed so that the LED lighting is not visible, but it can be used as is without the need for fitting. ⚠︎Since it is made with a 3D printer, there may be some burrs and layer lines. Please purchase only if you understand this. - Color: Gradient color Red Black Thank you for viewing. Number of parts: 2 If there are many requests, we plan to offer other colors and designs. If you want a color that matches your mouse, we will make it custom-made, so please contact us.