Nanoptics Tough Super Flex (TSF) fiber is our most flexible and durable fiber available, which is perfect for competition pros and weekend enthusiasts alike. TSF fiber has the same brightness as our other fibers, but with added durability for high performance under harsh conditions. Tough Super Flex fiber is strong and flexible enough to be tied in a knot without breaking. Each replacement pack contains five 12" fibers in your choice of size and vivid color. Our fibers fit all brands of archery sights and sight pins. Check with your sight manufacturer for proper size. Nanoptics is the worldwide leader of fluorescent optical fiber. As the leading supplier, we manufacture the brightest and toughest fiber in the industry. All of our products are proudly made in the USA.
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