Clear, unweighted mask that goes on after the fly is tied. Tie the fly, leave some room behind the eye, add super glue (Zap-a-Gap or Loc-Tite), slide the mask over the eye onto the materials, add a thread head to jam it in place. Perfect for unweighted streamers on a sink tip! Quantity per pack varies by size, see size listing. Sizes match the Fish Skull Living Eyes; 6mm eye fits the size 6 Mask.