Normann Copenhagen Stone Hooks by Helga I. Sigurbjarnadottir Design: Helga I. Sigurbjarnadottir Dimensions: 2 pcs.  approx. 2.75 (no 2 are the same size). Material: Islandic natural stone, no 2 are alike. Please Note: This is a natural product and all stone hooks are different in size and shades of grey.