Here is a handy design for a knot reference! 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. A set of these PRO-KNOT cards belong in your backpack and in the glove box of everyone's car or truck!