This hourglass sand timer is made of a unique crystal glass that narrows in the middle. The clear glass allows you to see the running sand. The solid marble carrera grey base makes this a total statement piece for any home or office. Attractive midnight black 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. Model # D838B-BASE. 5"D x 15 2.5lb. Handblown hourglass. 90 minute run time. Solid marble base.