Description from Dick Blick Art Materials
Designed for students and artists who need a firm, sturdy surface for sketching and a means to carry their sketching paper with them. Two heavy clips on the large board (only one on the small) hold a sketch pad firmly in place, and, once a sketch is completed, the oversized rubber band holds the bottom in place while it is being transported.
The board is made of 1/8″ (3 mm) thick masonite and is very lightweight, with rounded corners for safety. A hand hole makes carrying easier.Replacement Large Rubber Band — Keep your artwork flat and secure with Tote Board Rubber Bands. Each rubber band measures 10-3/4″ long and 7/8″ wide, ideal for securing your artwork at both ends of a drawing board.