Semperfli Goose Biots is the perfect material to dress segmented bodies on spinners, dry flies, nymphs, and emerger. Biots are the short, stiff parts of the leading edge of the large wing feathers. Available in a wide range of gaudy and classic colours. Semperfli Goose Biots are stiff and short, they make good tails for the Copper John, the Prince and other nymph patterns.