Waterproof plastic cards  mean you can take this little reference (just 2 1/4 x 3 1/2) with you  hiking, camping, or put in your car or truck glove box, and not worry about it getting wet or damaged! Six  cards are attached together in corner  with a brass grommet. 20 useful knots cover most any rope tying  situation: Bowline, Square Knot, Water Knot, Rolling Hitch, Sheet Bend  (Double Sheetbend too), Trucker's Hitch,  Buntline Hitch, Mooring Hitch, Sheep Shank, Cleat Hitch, Timber Hitch, Tautline  Hitch, Clove Hitch, Constrictor Knot, Double Fisherman's, Figure Eight  Follow Through, Prusik Knot, Butterfly Knot, Two Half Hitches, and the Bowline on a Bight.