A beautiful piece of art in its own right. Dichroic glass is glass that has been layered with metals or metal compounds. The result is glass that can change color depending on the angle of the light. Each of these buttons has beautiful glass chips inlaid into black resin, and each one is a little different. All made in the USA. They are mounted on shanks for convenience. About 1 inch square. You only need one to make a big impact!