Abstract: A drawing assembly configured for outlining the margin of a mat having a generally elliptical-shaped cut therein in a pattern replicating that of the cut, adapted for attachment to the mat cutting apparatus employed to make the cut, is comprised of a carriage slide member for adjustably securing a pen member at a selected location in cooperative engagement on a guide arm of a mat cutting apparatus, a pen member including a reservoir and a nib received in a stem member having a positioning arm thereon, a pen holder depending from the slide member including a barrel for receiving the stem member in axially reciprocable engagement therewith to permit the pen member to move between a lowered operating position and a raised non-operating position, a biasing member disposed within the barrel for biasing the pen member toward the operating position, and a locating member for guiding the nib when the pen member is in its operating position and the guide arm is set in motion.