Saltwater IGFA Hard Mono Ultra
hard alloy stiff nylon for the ultimate in abrasion-resistance and for carrying the fly in windy conditions. Guaranteed to break just under IGFA Class test. Easiest of all hard monos to knot.

All Rio tippet spools interlock for easy storage, have an elastic girdle boldly identified with the diameter and pound strength, and a grommet that keeps tippet handy and easy to locate.