SCIENTIFIC ANGLERS MASTERY BASS BUG FLOATING FLY LINE for Large and Smallmouth Bass. Specialized warm-weather coating built to withstand hot temperatures. Designed specifically for throwing large, air-resistant poppers and streamers. Over-weighted by two line sizes. Extended rear taper for line control and mending ability. Frog-Green running line with Shad-Blue head. WF6F thru WF10F.