Rio DirectCore Jungle Fly Line F/S3 – Powerful Front Taper That Delivers Larger Flies With Exceptional Ease. Perfect For “Jungle” Species Such As Peacock Bass, Dorado And Pacu. Low-Memory Core That Lays Perfectly Straight. Hard, Tropical Coating That Will Not Wilt In The Heat. The F/S3 line is a floating line with a 20ft long, type 3 (3-4 ips) fast sinking tip.