AOMAG Hand-blown Timer Magnet Hourglass / Magnetic Hourglass Sand Timer Clock Glass Classic Home Desk Decor Materials:glass,magnetic,and iron filings Dimensions (hourglass):5.7" high x 2.3" diameter;Dimensions (base):3" x 3" x 0.7" Sand is replaced with magnetic iron filings that form interesting, artistic patterns Includes magnetic stand that hold the glass vile in place 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