This hourglass timer is made of a unique crystal glass that narrows in the middle. The clear glass allows you to see the running sand. Our design with no side columns and a clear base is a one-of-a-kind. Attractive lime sand runs smoothly when flipped. Once started, the sand timer competes its run in 90 minutes. This is the ultimate sand glass clock to stay on time. A matching marble base makes this the perfect sand timer.