Ritchie W50 Wet Notes: Ideal for Work or Play Outdoors... Boaters, Divers, Naturalists, Campers, Engineers. Completely waterproof, for use under water. Two Sizes: Small 4 1/2" x 7 1/4" Notebook or Convenient 3" x 5" Pocket Notebook. Uses Regular Soft Lead Pencil (supplied with W-50 Noteook). Opens Flat for Easy Writing Plastic Ring Allows Easy Removal of Pages Tough International Safety Yellow Vinyl Cover.