Product description1. 4 ROBUST HOURGLASSES: This hourglass set contains 4 hourglasses in different colors, incl. 3-minute hourglass, 5-minute hourglass, 10-minute hourglass and 20-minute hourglass. It is ideal for reading, cooking and baking, brushing teeth, playing and training timing.2. SHOCK-RESISTANT HOURGLASSES: Our timer is made of resistant PVC, borosilicate glass, sea sand and protective cover, which means that the timer cannot be easily broken and the service life lasts longer. The hourglass is a very effective visual cue that improves attention and time management.3. BEST TOOL FOR TIME MANAGEMENT: It helps your children to make things more efficient and develop a strong sense of time. The timepiece can be used for cooking, playing, classrooms, parenting and training. Can also be used as a home or office decoration and timing tool. Great gift for kids and friends.4. ADVANCED TECHNOLOGY: Hourglass has matching black shaped end caps and clear thick wall. Each timer is provided with colored sand and a clear digital display for easy identification.