Special blades to give your fly more action. You can influence the action in various ways .. look at the picture. These blades are also great for the well-known asp foam fly. These blades are fitted with a convenient slot so that the blades are easy to apply and easily attach to the hook with a drop of glue and tying thread. They then stay well fixed so the action is constant. That is essential for this type of fly. 10 pieces in a bag.