This simple little book contains all the really useful knots any boating person needs to know. The selection of a knots involved a long process of contacting lots of people and finding out what knots they actually used on their boats. The original idea was to have the top ten but the research showed that there are really only eight knots regularly used by most sailors. So thats whats in this little book. Pocket sized ( 110x 150mm) and waterproof.