GrafixMat laser engraved cork coasters are made of earth friendly, ecological material. The high quality natural cork is pressure bonded onto a composite wood backing creating our rigorous signature dual layer construction. All edges are carefully rounded and finished. The back side of all coasters are complete with colorful graphics and interesting story text relating to the graphic engraved on the front surface….plus four felt feet to protect valued surfaces, a hanging hole for optional display and a clear protective coating on the back. Dimentions: 4.25 inches (10.8 cm) in diameter and approximately 5/16" (7 mm) thick.