This glass hourglass is made of strong and durable borosilicate glass with high transparency and is hand blown. The inside of the hourglass is filled with different colors of carefully selected sea sand. The sand flows slowly down and has a unique aesthetic feeling. You can also watch the sand falling slowly to relieve your stress and exhaustion. This hour glass will give you a relaxing and enjoyable experience. This sand watch can be used as a graduation gift, wedding gift,birthdaygift, or special holiday gift such as Christmas, Easter, Thanksgiving, Valentine's Day. This transparent and exquisite glass hourglass is sure to delight and amaze your family and friends. They will also love thissand glass timer sandglass.