Adopting environmentally friendly materials, which it is safe to use. And it has small size and light weight, which it is easy to carry while it has various colors to choose from freely. Come with the irregular shape makes it more eye-catching. The colorful colors are suitable for decorating grass or fish tanks. Made of plastic, it is durable to use. The length of the product is 1.4 cm, the width is 1.1 cm. It has a good luminous effect in the dark, and after sunlight or light, the luminescence can last about 5 to 8 hours. Item Name: Luminous Pebbles Material: Plastic Features: Tasteless, Long Lasting, Multi-functional Color: Mixed Color, White, Lake Blue, Light Pink, Green, Fluorescent Green, Orange, Orange, Fuchsia, Royal Blue, Yellow, Light Green, Pink Size Details: 1.4cm x 1.1cm/0.55" x 0.43" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. The quantity is about 300pcs, due to manual calculation, the quantity might has 1-5pcs more or less, hope you can understand, thank you. Package Includes: 300 x Dark Aquarium Pebbles