Tubular Bead

The image shows a cylindrical bead made of stone or metal. The bead is gray with dark spots and has rounded ends. The bead is lying horizontally and has the number "306" stamped on its left side. The bead appears to be made of a speckled material. It is placed on a white surface. There is a small metal ruler below the bead on the left and a small metal plaque on the right that reads "THE METROPOLITAN MUSEUM OF ART 1930". The bead is titled "Tubular Bead" by an unknown artist.