XIUH 1CM Small Luminous Stone Fish Tank Garden Fluorescent Micro Luminous Stone 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 areas shown. Color: Multicolor Package includes： 50 x Small Luminous 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:50x Stone Size: 3.89 inch x 3.09 inch x 0.79 Service: Hello customer, if you have any questions, please feel free to contact us and we will reply to you within 48 hours.