Heavy duty glass project board / cutting mat from Glass Board Studio. The glass board has measurement grids (see photos) spanning 16 × 22 inches, and there is an extra inch around the edges of the board, making the entire board 18 × 24 inches from end to end. This project board is used, but is still in great condition. According to glassboardstudio.com, this board is heat resistant, easy to clean, stain proof, and made from durable ¼ inch thick glass. Retails for $150 new.