Safe and Durable: The timer is made of durable and transparent acrylic, safe and non-toxic, no harm to children. Therefore, it is the most suitable hourglass for children. This sand glass timer is also a very good toy for children. It is safe and reliable for children to use. The Perfect Size: This timer sand clock is small, portable and powerful, making it easy to take with you on a road trip or business trip. This small sand timer toy won't take up too much space in your suitcase. It's very easy to take them with you.