?Tips? Please kindly understand that the sand timers are not precision timing device, so there is time deviation, If the product came damaged or not working, please feel free to contact us. ?Multi-purpose? The timers will make your kid brushing time more fun and more productive, they also work well for games, timed test, time management, classroom, cooking etc. Also a nice decoration for your home and office. ?3 Minute Timer? The timer runs for approximately 3 minutes, help your kids brush their teeth long enough. ?Material and Size?The inner of the sand timer is glass while the outer layer is plastic, double layer protector can well protect the timer from breaking. The hourglass timer measures about 10.2*2.2cm. ?Package Include?5 pack colorful timers for brushing with 5 different bright colors, include Yellow/Pink/Orange/Blue/Green. Great to have plenty of backups and share with friends.