IANTD - CCR Skills Sheet Set, Confined (C-3400-1) and OW (C-3400-2) - The waterproof flexible sheets are designed to accompany the diver on the dive and are easy to read underwater. They are nearly indestructible and can be rolled or folded into a compact size.They are printed on both sides of white waterproof fabric sheets using special flexible inks, in black with blue highlighting. With the same rounded corners and size as the IANTD waterproof tables, the { 7 in x 9 in | 17.2 cm x 22.9 cm } sheets have a punched hole so you can assemble several into an easy-to-manage collection.