The 10 hourglass glass has many different meanings, such as friendship, affection, love, pessimistic people think that love is like the hourglass of the sand as captive. Please put these hourglass in a safe and flat place and keep away from children?s reach. These sands timers are designed for games, sports, home, kitchen, decorations, souvenirs, not a precision timing device, so may be a little time deviation. Meanwhile, sand flowing speed can be affected by temperature. By flipping your sand clock, you give yourself 10 minutes of an uninterrupted workflow. Just make sure that what you have to do is done in 10 minutes.