This unique disk is made from brown Ammonite. Ammonite is an extinct shelled cephalopod that died out around 66 million years ago. These disks will all vary in size, shape, and coloring, as they are made from a naturally formed material. Each disk will measure 3″ roughly and weigh under 1/5 lb. This disk can be displayed on a stand like pictured, or placed flat on a coffee table book stack or desk corner.