Colorful Luminous Sand Fish Tank Garden Micro Color Luminous Fluorescent Small Gravel Features: Environmental protection material: It is made of non-radioactive resin, which is good for human body and living environment. Luminous Effect: These crushed stones last about 5 to 8 hours after being exposed to sunlight or light. Unique stones for different decorating styles: These stones can be used to create beautiful and paths, aquariums or gardens. A variety of colors for you to choose: you can give it as a gift to your family, friends and colleagues. Beautiful and durable, can be used for a long time. SMALL AND PORTABLE: You can bring these glow-in-the-dark stones to your campsite for a great night out. Product Description: Description： Material: Polystyrene resin Dimensions are as shown. Color: Multicolor Package includes： 4000 x Colorful Luminous Sands Notice : Due to the difference between different monitors or color reflecton in the monitor lighting,background etc, the picture may not reflect the actual color of the item. Please allow 1-5mm error due to manual measurement. Item Name:3-5mm Colorful Night Glow Sand 4000PC White Product color:White Size:One Size Commodity Materials:Polystyrene resin.High-quality materials to take care of you and your family's health. Included:4000x Night Glow Sand