Waterproof plastic cards mean you can take this little reference (just 2 1/4 x 3 1/2) with you hiking, camping, etc. and not worry about it getting wet! Six cards are attached together in corner with a brass grommet. This 6 page card set contains these 20 essential knots and will cover most any rope tying situation: Bowline, Cleat Hitch, Sheep Shank, Square Knot, Water Knot, Rolling Hitch, Sheet Bend (Doubled Sheet Bend too), Trucker’s Hitch, Timber Hitch, Mooring Hitch, Tautline Hitch, Clove Hitch, Buntline Hitch, Constrictor Knot, Double Fisherman’s, Figure Eight Follow Through, Prusik, Butterfly Knot, Half Hitch and the Bowline on a Bight. A set of these PRO-KNOT cards belong in everyone’s backpack, garage, glove box, etc!