Hardy Zephrus Saltwater. The Hardy Zephrus series of fly rods features award winning Sintrix material - Sintrix 440. The Zephrus exhibits ultra high recovery yet retains in hand feel alongside an incredibly powerful butt section. Sintrix (Silica Nano Matrix) 440 has up to a 60% increase in compressive strength and up to 30% weight reduction over traditional graphite blanks. The Zephrus is generally a high scoring rod in competitive shootouts. Features: REC Black pearl recoil guides, Fuji Titanium stripper guides, fast action blank design in gray blue color, bar stock 6061 aluminium and Triaxial carbon spacers depending on model, oversized fighting butt.