This is the Communicate Under Water - Writing Slate/Table for CommunicationFeatures: Assortment of sizes: MD 4 x 6", LG 6" x 8" and XL 8" x 10" Heavy-duty attached pencil Hole in table allows for easy attachment to nylon cord, lanyard, clip, etc. Easily erase and re-write both above and below the water Great for underwater class settings for students and instructors alike band color varies This Trident Underwater Writing Slate means that you don&';t have to struggle to share your thoughts underwater any longer.