Semperfli Predator Fibers Fly Tying Synthetic - Predator Fibers means you have the perfect material for your baitfish, predator and streamer patterns. Predator Fibers will disperse water easily from the high quality synthetic hair and will still retain its shape. Predator Fibers works equally well as parachute posts, underwings on dry flies or even dubbed as fly bodies. Each pack contains strands 20in (500mm) overall length folded in 2. Also in the range are unique blends which are truly amazing.