river peak FLY LINE DT 4 F #4 Double Taper Floating 100ft(30.5m) Fly fishing line Type:DT-4F (Doble taper floating #4) Length:100 FT (about 30.5 m) Core:Braided (Dacron) Coating:PVC Please refer to Photo 3 for detailed specifications. This is a brand of Japan called river peak.