Rio's premium 65lb, 8 carrier backing is stronger, softer and smoother performing backing! It's comprised of 8 strands of tightly woven fibers that stack perfectly on the fly reel. Backing changes bright colors every 10 meters and compliments fly reels with a beautiful color splash and functionality. Suitable breaking strain and diameter for all fishing from pan fish to ultra-big game such as GTs, billfish and Tarpon.