Item Type: Glow Sand Stone Material: Resin Stone size: 3-5mm Color: Multicolor,Yellow,Orange,Green,Blue,Purple,White Features: 1. Luminescent stone Made of high-quality resin, non-toxic, tasteless and non-radioactive, Will not cause harm to people or fish tank. So you can safely put it in the bedroom 2. Decorative sand stone can be used in fish tanks, swimming pools, bedrooms, living rooms or back gardens. Most people use them for driveway or garden decoration, while some people use them for interior decoration, such as room decoration, or even make them into art to give to friends. 3. After the product is stimulated by visible light such as sunlight and light, it absorbs and stores energy, and naturally glows for a long time in the dark. 4. The luminous sand stone need to be spread out to ensure that the luminous stone gets the maximum light. The more stones you put together, the longer they will shine. Package includes: 100PCS/2000PCS/5000PCS/7000PCS (optional) x Glow Sand Stone