Product 1.4 RUGGED HOURGLASS: This hourglass set includes 4 pieces of hourglasses in different colors, including 3min hourglass, 5min hourglass, 10min hourglass and 20min hourglass. It is ideal for reading, cooking and baking, brushing your teeth, playing games and timing your workout. 2.SHOCK-RESISTANT HOURGLASS: Our timer is made of durable PVC, borosilicate glass, sea sand and protective cover, which makes the timer not easy to be broken and the lifespan longer. The hourglass is a very effective visual cue that improves attention and time management. 3.BEST TOOL FOR TIME MANAGEMENT: It helps your kids to do things more efficiently and develop a strong sense of time. The timer can be used for cooking, games, classroom, child education and training. Also can be used as home or office decoration and timing tool. Great gift for kids and friends. 4.ADVANCED TECHNOLOGY: Hourglass features matching black molded end caps and clear thick wall. Each timer is colored sand and has a clear digital display for easy identification.