One set of 4 smooth, high quality charcoal cement coasters with metallic copper edge. Industrial concrete with a cleanly painted metallic accent makes a sleek and striking addition for any home, as well as a great gift. Each coaster is carefully poured, painted and finished by hand to ensure the highest quality product. * Each measures about 4.25 inches (10.8 cm) in diameter. * Four cork buttons are firmly affixed to the bottom of each coaster to protect furniture surfaces.