These knobs are moulded from white concrete with a 30-35mm screw and nut set in. Each knob is then carefully painted into the designs you see above. Diameter between 40-50mmDepth 25mmDue to the natural setting of the concrete each piece is individual therefore no two drawer pulls will be the same. Please specify which designs you would like when ordering, whether painted or not and quantities of each if buying in sets. Thanks for looking!