Simply place these beautiful marbles near any light source, such as a lamp, flashlight, or in sunlight, and they will automatically absorb energy The more light these glow-in-the-dark marbles absorb, the brighter they glow in the dark, emitting different shades of green depending on the angle and intensity of the light. Imagine yourself in the universe; it will create a magical and dreamlike world for you These glow-in-the-dark glass marbles are made of glass, each meticulously polished to a smooth, rounded surface with rich colors. During the production process, each colored marble undergoes careful polishing and inspection, resulting in a beautiful, dreamlike surface, long-lasting color, durability, and resistance to breakage, allowing for worry-free long-term use These glow-in-the-dark marbles not only shine captivatingly in the dark but are also compatible with most track toys. They serve as a perfect replacement when your block track toy marble accessories are accidentally lost They can also be incorporated into various DIY home decor projects, such as filling vases, present bags, fish tanks, or desktop ornaments. Unleash your creativity and add a vibrant touch to your home