Here is smart design for a fishing knot reference that can be used and stored around water without worry about it getting wet. The Pro-Knot Fishing Knot Cards are waterproof plastic cards that you can stash(just 2 1/4 x 3 1/2) in a tackle box or on a boat for years worry free and have it handy when you need it! Five cards are attached together in corner with a brass grommet. 17 most popular fishing knots are clearly illustrated: Improved Clinch, Palomar Knot, Uni-Knot, Dropper Loop, Surgeon's End Loop, Blood Knot, Rapala Knot, Double Uni-Knot Surgeon's Knot, Butterfly, Half Hitch, Prusik and Perfection End Loop. Every angler should have a set of these little cards in their tackle box or fishing vest!