Dropresistant hourglass 6piece set The dropresistant 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 colors and clear numbers, which are easy to distinguish.Shockproof hourglassThe hourglass is made of a sturdy plastic cover, borosilicate glass, sea sand and a protective case. This is not easy to damage the hourglass and has a longer service life. The hourglass is a very effective visual cue, which can improve attention and time management.The best time management tool It can help your child improve work efficiency and strengthen time perception. The clock can be used for brushing teeth, cooking, playing, in the classroom, parenting and training children. It can also be used as a home decoration or office decoration and time setting tool. A great gift for children and friends.Note This is high borosilicate glass and hourglass glass, not a real time setting 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.