Moulding is a length of wood, aluminium or plastic designed to be mitre-cut to form picture frames. A huge array of designs is available, in varying widths, depths and finishes like; painted, embossed, laminated, veneered or gilded designs, many are sold unfinished so that framers can apply their own finishes and flourishes by hand.

Glass size is the total width and height of the frame contents, including the subject/art, any border created through mounts and the 5mm overlap required for the moulding to prevent the contents falling out.