Amount of package: you will get 4 pieces 3 minutes sand timers (random color), different color for different people or application Brush teeth assistant: the little tooth hourglasses work great as brushing timers, they make teeth brushing time more fun and productive, dentist recommended if you have trouble with your kids brushing their teeth Multiple applications: the sand timers also work great for cooking, games, timed test, time management, sitting still game, classroom, exercising timer and timing kids' study, nice decoration for your home and office, great gift for children and friends, ideal supplement when you play games, making your game time more exciting Safe material: made of durable PVC, quality borosilicate glass, non-toxic sand, not easy to be broken, very safe for kids to use, these timers are also waterproof, ideal sand timers for kids or as kids teeth brushing timer, it will not break under normal usage conditions Size information: each 3 minute sand timer size is approx. 2.3 x 9 cm/ 0.92 x 3.6 inches, please shake the hourglass, so that all the sand loose under the condition of inverted on the table to start the clock