This is a kind of quality kaleidoscope prism, which is made of quality optical glass and hardware, wear resistance and can provides long service time. 77mm diameter bayonet, only fit for 77mm lens. Or you can connect with adapter-rings to convert into lens in other diameter. With this glass prism, you can get some interesting effects while taking a photo. You can have a try. Features: Made of quality optical glass and hardware, wear resistance and can provides long service time. 77mm diameter bayonet, only fit for 77mm lens. Or you can connect with adapter-rings to convert into lens in other diameter. With this glass prism, you can get some interesting effects while taking a photo. Also a new way to observe the world, you can see a novel scenery, night scenes, and etc.. Specifications: Name: Kaleidoscope Prism Material: optical glass+hardware Diameter: 77mm / 3.03in Package size: 137 * 136 * 45mm / 5.39 * 5.35 * 1.77in Package weight: 245g / 8.64ounce Packing List: 1 * Kaleidoscope Prism 1 *Cleaning Cloth 1 * Storage Bag