Features: Quality material: This glass marble is made of quality materials and can be applied as a nice gift at festive parties and birthday parties, it can also be applied for decorative items such as fish tanks and decorative fillers, it has a magic luminous effect. Fun to use: These marbles are very easy to use and fun to play with, roll, throw, drop, or knuckle marbles with your friends, you can make the marbles sunbathe, or illuminate them with ultraviolet light to make the marbles shine brighter and longer. Specification: Material: glass Size: 1.4 cm/ 0.55 inch Quantity: 48 pieces Package content: 48 x Marbles glow in the dark Warm notes: Recommended for ages 5 years and up. Please allow slight deviation due to manual measurement. Please allow slight color difference due to different monitors. Choking risk may exist, under the age of 3 need to use it under the supervision of adults.