American Porcupine Guard Hairs- Fly Tying & Crafts. These quills are perfect for tails on Stoneflies, Stone Clinging Mayfly Nymphs, Mayfly Nymphs, Baetis Nymphs and Midge abdomens. Porcupine Guard Hairs also make realistic antennae's on caddis adult and pupa patterns as well as stoneflies. Use the butt end for very realistic Stone Clinging Mayfly Nymph legs and the tapered end for long Cranefly and Midge legs. Porcupine Guard Hairs accept permanent marker pens for "matching the hatch" (Copic Sketch Markers). Roughly 150 strands per pack.