The hourglass timer is very precise, with a maximum deviation of less than 4%. The hourglass running time set is based on the scientific and efficient Bath Law standard. Every family member can use these funnels to enjoy the fun of brushing their teeth <br>After testing, the bases at both ends are not easy to pull out, so the sand of our timer is not easy to leak, and the plastic shell can prevent the timer from falling and breaking. Even if the glass funnel inside is accidentally broken, no glass slag will fall out <br>Idea for everyone's tooth brushing. Save your time and money, keep your teeth healthier. These hourglasses are also can be perfect timers for shower, study or game. Boys and girls will enjoy working with this fun timer. <br> <br>Specification: <br>Material: Plastic and glass <br>Color: Red, pink, purple, green, yellow, orange, blue <br>Size: 2.2x2.2x10cm/0.9x0.9x3.9 Inch(LxWxH) <br>Quantity: 7 <br> <br>Package includes: <br>You will get a set of hourglass timer in 7 colors, red, pink, purple, green, yellow, orange, blue.