DescriptionDon't ever forget how to tie that knot again! This 3 card set fits easily in a shirt pocket or tackle box and also folds out to a 12" ruler. Waterproof plastic cards feature clear illustrations of 10 most popular knots: Improved Clinch, Palomar Knot, Uni Knot, Surgeon's Knot, Double Uni Knot, Perfection Loop, Dropper Loop, Surgeon's End Loop. Nail Knot and Blood Knot. 4x2 inches