... :55mm Materials:Zinc alloy Roman and others for your choice Clock insert:RZ-CK055-Diameter:55mmMaterials: Zn AlloyFinishe: Gold/SilverType ... :Roman or others Free replacement battery with each clock inserts.Available size:27mm,33mm,37mm,43mm,50mm,55mm,60mm ... we could produce the custom-made clock inserts as per your request,welcome to order. New items/Clock inserts/clock fit-ups RZ-CK055