Fall-resistant hourglass 6 piece set: The anti-fall hourglass contains 6 hourglass timers. A set of timers for 3 minutes, 5 minutes, 10 minutes, 15 minutes, 20 minutes and 30 minutes. The top and bottom have different colours and clear numbers, which are easy to distinguish. Shockproof hourglass - Thehourglass is made of a sturdy plastic cover, borosilicate glass, sea sand and a protective cover. This is not easy to damage the hourglass and has a longer service life. The hourglass is a very effective visual hint, which can improve attention and time management. The best tool for time management: It can help your child improve work efficiency and strengthen time awareness. The watch can be used for brushing, cooking, playing, classroom, parenting and training children. It can also be used as a home or office decoration and timing tool. A great gift for children and friends. Note: This is glass with high borosilicate and hourglass glass, not a precise timing device, so the mechanical watch cannot be replaced. Please allow a deviation of 10%. Do not use at the same time to scratch the marks on the top and bottom of the hourglass to avoid confusion