15 Minutes - Hourglass is another wonderful expression of time. 15 minutes can be used for relaxation, exercise, games, cooking, or studying. 15 min a day can develop a good habit. Sturdy & Safe - This hour glass comprises a metal frame, borosilicate glass, and sand, is hand-welded and assembled, and is durable. The glass has a good light transmission and is not easy to break. Vintage Decor - Besides being an hourglass timer, it is also a perfect retro decor that can be used for home office decor. Putting it on a desk or bookshelf in your room is a good idea. Unique Gifts - It is a meaningful gift. You can give this sand clock as a birthday, wedding, housewarming, anniversary, Father's Day, or Christmas gift to your family, friends, teachers, or coworkers, impressive. Great Service - Every sand timer has passed strict inspection and testing. If you are dissatisfied with it, pls CONTACT US BEFORE REVIEW, and you will get a satisfactory answer! Notice - Hourglass is not a precise timing tool, with an error rate usually within 6%. If the hourglass stops working due to changes in temperature and humidity, you can put it in the sun, or shake it evenly before use.