About this item Safety Sand Timer: The large 5 minute sand timer made by friendly high borosilicate glass and acrylic material. And each one has a number of time mark. easy to distinguish which timer for which usage Unbreakable Design: The outer layer is made of hard acrylic material and the inner one is made of glass，which is protected by double layer. Besides, the colored textured top caps are firm & durable, so it will not easily cut your children's hands TREASURE of TIME: The sand timer 5 minutes help your kids do things more efficiently and develop a strong sense of time. The 5 min sand timer can be used for cooking, games, classroom, study, desk office decorative and teachers use Notice: This hourglass timer 5 minute is mainly made for games, which is not a precision timing device, so there is time deviation. But SuLiao hourglass sand timer has achieved the highest quality ±10% industry standard in the USA. Money-Back Guarantee: Our kids hourglass timer sand clocks 100% has been strictly tested by the factory. If you are not completely satisfied with it, pls CONTACT US BEFORE REVIEW and we will provide a full refund for you!