This Marble/Brass 30 Minute Hourglass measures 7"H. The hand blown glass is filled with white sand, it sits on a marble base and it is supported by two brass columns that hold the hourglass in the air so it can be easily rotated as needed. This is a very popular item for corporate events and parties. Hourglasses are aesthetically pleasing ornaments, rather than accurate timepieces. This hourglass is usually accurate to within 5 minutes.