Trident 3-Ring Zippered Dive Log Organizer Starter pack of log pages included Zippered log book made of water resistant Cordura material Measuring at 7.5 inches x 10 inches, holds standard log pages as well as writing equipment, certification cards, business cards, planners and more Plenty of space for pages of equipment information, including purchase date and place, or personal/identifying information Three ring binder construction works with generic log book pages