Made of selected delicate sea sands, inner part is made of clear and transparent glass, outer part is shatterproof plastic, double protection. It is safe enough for children to use. It can provide excellent decoration for your home and office. Unique design and cute appearance make it stand out everywhere. It will add more design to your space. Ideal for timing cooking, writing, playing, working, and learning and so on. Also can use as a wonderful present for your children and best friends. A practical and powerful timer for kids to cultivate a clear and correct concept of time, and a very funny and exciting toy for kids. Brilliant choice for children.