Most glass toys are made of pyrex glass, which is very strong and won't break during use, if that's what you're worried about. That said, it's still glass, and may break if dropped on a hard surface. This is why it's important to handle glass carefully - it might survive a fall, but it's best not to take the chance. In the event that it does break, pyrex will come apart in big chunks rather than a trillion tiny pieces. Also, always check for fractures and scratches before each use, and don't use the toy if you find any.