Huge and Fabulous Red and Black Mid-Century Modern Buttons Great size, form and detail make this set of three buttons outstanding! Black backs with edges showing on front contrasted with slightly hollow front filled with shiny very textured semi transparent red abstract grid with diagonal quarters that reflect light in amazing ways. I think they are made of early plastic material. Think the red is Lucite. Black doesn’t test positive for bakelite, but sometimes that is the case with black. Has that great clunk sound. Black discs measure 1 ¾” in diameter. Free form inside red 1 ½”. Fabulous for a vintage sewing project. Imagine them on a coat!