High Quality Materials: The plastic smiling sand timer is made of durable and transparent Acrylic and is therefore the best timer for children. Hourglasses and timers plastic are visual tools that help children grasp the concept of time and help them understand transitions in their daily lives. This is a wonderful toy and practical time instrument for children. Suitable for Kids: This sand glass is small and delicate, very convenient for children to use. This plastic sand watch is exquisitely beautiful in shape and bright in color, which is very attractive to children. And this small timer can help children time various daily activities, helping them to organize their time and plan their lives.