steel key ring, with galvanized ring. we engrave the name, a date, etc. on one side. license plate size 40x10mm (4x1 cm), key ring size 25mm. Since the surface is 4cm, with more letters you have a smaller writing. with bag engraving on one side license plate size 40x10mm (4x1 cm), key ring size 25mm. The writing is not "hollowed out", it is an indelible mark that is laser-imprinted on one side of the tag. The metal of the sign is 304 steel, hand polished on both sides. Please consider the measurements of the license plate when providing us with personalization instructions. If necessary, you can contact us first to define the format, then proceed with the purchase.