45 min hourglass size: 20.5*12.5*6cm. Weight: 535g. Material: wood and glass and sand. For: Valentine's Day Gifts, Birthday Gifts, Kitchen Cooking, Playing games or practice time, Wedding Gifts, Bedroom or study or office, Crafts, Decoration ornament, personal collection, Classroom, Table Decoration, Restaurant, Living Room, Home, Christmas and New Year Festival, Coffee Table, Book Rack These sand timers are designed for daily use, not as a precision stopwatch, with maybe be 6% deviations in time and size. The flowing speed of the sands may be affected by temperature and humidity. Please allow little color difference due to light and screen brightness. Choose different colors for different people. The different colors of the hourglass represent a different meaning. Blue hourglass: wisdom, sky, freshness, vitality of life. Purple hourglass: mystery, romance, love. Black Hourglass: serious, night, calm. White hourglass: pure and simple. Hourglass Orange: no confusion, strong upward mobility, strong social skills. Green hourglass: life, security, youth, peace, freshness, nature, stability, growth To make the hourglass, strong material, high quality borosilicate glass and high-end handcrafts. With luxury craftsmanship and modern fashion outline, it is exquisite and beautiful, silently recording every second. Slow flowing sand, you can enjoy the beautiful weather and the wonderful memories. And it's a COOL timer because the hourglass makes timing more fun. Sand, shining like stars, makes your space more boring