Sand Timer: The time is measured by the time it takes for the ball filled with sand to from the top through into the bottom ball. Once all the sand has flowed to the bottom ball, the hourglass can be reversed to measure time European Retro Style: Vintage style and creative design will show your special taste in beauty Iron Tower Hourglass: The hourglass, also known as the sand clock, is a device for measuring time. Designed with Iron Tower Home Decoration: Perfect to decorate your home and office, great as a gift to children and friends. Such a pretty and practical decoration will deserve your favor Material: Made of high quality plastic and metal materials for durable long time decoration. Classic style and design