This fly drying patch permanently adheres to clean dry surfaces. The grid of mushroom capped posts holds you flies securely. This patch grips flies from #16 up through #3/0. Flies can be held horizontal, vertical or diagonal. Different size hooks need to beheld in different orientation. The smallest flies should be set diagonally. I placed the patch on the dash board of my boat out of direct wind where clothing will not brush the flies off. The best solution to prevent storing damp flies that will rust hooks. Look for different sizes on the site into the future. Works for lures as well.