This is the IST Underwater Notebook with 25 Reusable Waterproof Pages Features: Contains 25 pages of reusable waterproof paper The cover is made from durable 2250D PU coated ballistic nylon Clear-window pockets on the inside and outside of the back cover for important items such as tables, checklist, compass etc Dimension- Open (H x; W): 20cm x; 25cm (8 x; 10") Dimension- Closed (H x; W): 20cm x; 12.5cm (8" x; 5") A handy tool for communication, note taking, surveying, and fish ID! Also a great item for boating or rainy conditions when writing is necessary. Take this great notebook with you on your next dive. "