Size: 9.1cm*2.3cm*2.3cm. See image if not clear to you. Easy to store and carry during outdoor activities. Material: Made of durable PVC, high quality borosilicate glass, non-toxic sand and protective wrap. Not easy to be broken, very safe for children. These timers are also waterproof, perfect for kids or for brushing teeth. It will not break under normal use. Application: The timer Widely used on children brushing teeth, exercising, time out, reading, homework, play promise; Help your kids do things more efficiently and develop a strong sense of time; Ideal for kitchen, meeting, tabata, classroom use, home, office, store decoration. Great Christmas gift for children, friends and teachers. Also a small promotional gift for customer. Package includes: 7pcs 3min hourglass (random color in yellow, green, blue, pink, purple, red, orange). Different color for different people or applications. Note: Hourglass is not a timing device, please allow time deviation. Inner Glass interior and PVC exterior make sure kids don't even hurt themselves. A smiley face on each base keeps users in a good mood for the new day.