RIO Premier Bonefish Fly LineSpecifically Designed For The Bonefish Fly Fisher. RIO's Bonefish line has a long head and rear taper to smooth out the loop, and to make long efficient casts, while the mid length front taper produces great turnover and easy presentation of typical bonefish flies. This is a great line for the more experienced flats angler, and ideal for fast 2nd shot casts to cruising fish. Revolutionary design allow for incredible loop stability and distance Unique,