Pieces 15x21 - 3 pieces 13x18 - 4 pieces 10x15 picture frame set the frame is made of hard resin polyre. it is straight and smooth. there is a transparent plastic pet guard as front protection. 3mm as back cover. raw mdf is used. (we do not use cardboard or cardboard in any of our products) corner joints are produced perfectly and precisely. it can be hung on both sides. nails are sent to hang it on the wall. maximum 9 pieces of this product can be ordered. swordslife reserves the right to cancel orders over 9 units. more than 100 stocks are offered to be sold at the campaign price. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.