The AquaSketch Minno is the world's most convenient and durable way to take notes underwater. Not only does it simplify the task of writing or drawing, It also offers unlimited paper capacity making it unnecessary to waste time erasing during a dive. Small enough to fit in a pocket, the Minno can be worn on your wrist or attached to your BC with a retractable lanyard. 2¼" X 3½" Writing/Drawing area. Holds up to 8 feet of vellum. Rugged design, made of poly carbonate and acrylic.