Eternity RX10 4-Piece Fly Blanks Rainshadow’s Eternity RX10 Fly has been the most anticipated series of fly rod blanks in Batson history. After a year and a half of development and testing by our in-house product team, this high modulus, fast action blank lineup is our polished response to elite fly anglers and professional fly rod builders seeking the very best. We invite discerning fly anglers everywhere to experience Rainshadow’s new flagship fly rod blanks series. You won't be disappointed.