Pieces of a4 frame. you can use it for your a4 document diploma pictures and photos. high quality material, smooth cut and robust combination. easy content change thanks to flexible nails. 2mm real glass is used. back protection is hard corrugated cardboard. concrete nails will also be sent for hanging on the wall. inner dimension is 21x29.7cm. the thickness of the frames is 2cm. material: laminate can be used on the wall horizontally and vertically. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.