Hourglass Timer Set: The package includes 6 hourglass timers. 1 minute, 3 minute, 5 minute, 10 minute, 15 minute, 30 minute timer in one set. Both sides have different colors and clear numbers, easy to distinguish. Shockproof hourglass: Our hourglass is made of sturdy plastic cover, borosilicate glass, sea sand and a protective cover, which means the hourglass will not be easily damaged and has a longer service life. The hourglass is a very effective visual cue that can improve alertness and time management. The best time management tool: It can help your child improve work efficiency and improve time awareness. The clock can be used for children's toothbrushing, cooking, games, classrooms, parenting and training. It can also be used as a decorative and timing tool for home or office. Great gift for children and friends. Note: It is high borosilicate glass and hourglass. It is not an accurate timing device, so mechanical clocks cannot be replaced. Please allow 10% deviation. At the same time, please do not scratch the text on the glass with anything to prevent the text from falling off.