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Why did graphite become a popular material for fly-fishing rods?

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Graphite became a popular material for fly-fishing rods in the 1970s because it offered a significant advancement in performance over the previously dominant fiberglass rods.

The primary reason for its adoption is graphite's remarkable strength-to-weight ratio, which allows for the construction of rods that are both lighter and more responsive. This material perfectly suits the fly angler's ongoing pursuit of more delicate and efficient tackle. As a result, carbon fiber and graphite materials replaced fiberglass, becoming the standard choice for modern fly-fishing rods.12