High Quality Hourglass: Made with sturdy PVC and ABS glass tube, non-toxic sand and protective cover. it is not easily broken. Each size: 3.7 x 0.98 inches. Package includes: Each timer set is available in black, blue, green, red, yellow, pink. including hourglass with 30 seconds, 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes. Convenient to carry: The clock hourglass is small in size and light in weight, convenient to carry, suitable for indoor and outdoor activities; It can be considered as an adorable gift for kids, classmates, etc. Wide Application: The hourglasses work great for cooking, games, timed tests, time management, sitting games, the classroom, exercise timer and children's study, a nice decoration for your home and office. Note: Hourglasses are designed for game play, each with a 10% time difference.