Zicome Hand-blown Glass Sand Timer Magnet Magnetic Hourglass with a Iron Base Materials:glass,magnetic,and iron filings Dimensions (hourglass):6" high x 2.25" diameter;Dimensions (base):3" x 3" x 0.75"; Timer is approximately 20 seconds long. The Magnetic Sand Hourglass is a fun desktop diversion. Flip it over and watch the grains of iron stack up in seemingly impossible formations thanks to a magnet embedded in the iron base. Watching time fly has never been so interesting!The craggy configurations of the iron filings eventually build into an ordered hemisphere with a spiky surface. Like your favorite movie, you can enjoy watching the Magnetic Sand Hourglass over and over again.