From the Dr. Seuss Collection. Dr. Seuss Magnetic Dry Erase Board with Pen 12 Piece Pack. A total of 12 single dry erase boards are included in this pack. Each board includes a dry erase pen with a small eraser attached to the lid of the pen. This assortment contains a variety of four styles themed after Dr Seuss classic books. Green Eggs and Ham, Cat in the Hat, Horton, and Thing One and Thing Two. Each board measures 5" x 7".