For those unfamiliar with Zamac Buttons (also known as Zamak), they are buttons made with a base metal of zinc and combined with other alloying elements such as aluminum, magnesium, and copper. These particular metal buttons are strong and combine the look of class with sophistication flawlessly. Here we have a grouping of round, four-holed buttons with a slightly concaved center, a brushed surface, and in a silver coloration. Carried in sizes 15mm, 20mm, 23mm, and 25mm, 30.5mm.