XIUH Diamond Shaped Luminous Stone Fish Tank Aquarium Landscaping Luminous Stone Features: Environmental protection material: Fluorite is made of nonradioactive resin, which is to human body and living environment. Glow-in-the-dark effect: of these gemstones lasts about 5 to 8 hours after exposure to sunlight or light. Unique Stones for Different Decorative Styles: These stones can be used to make a path, aquarium or garden beautiful and romantic. 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 lightness to your campsite for a great night out. Product Description: Description： Material: Acrylic resin Dimensions areas shown. Color: Multicolor Package includes： 200 x Glowing stones 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. Home Decoration Material: Acrylic Resin Include:200x Stone Size: 2.79 inch x 2.79 inch x 1.19 Service: Hello customer, if you have any questions, please feel free to contact us and we will reply to you within 48 hours.