Berkley Fishing ProductDetails Berkley FireLine is unlike anything you've fished before. It's stronger than monofilament. It casts farther. And it handles as well -- even better in some situations. It doesn't create birds nests by digging into your spool. And it ties easier knots, makes smoother casts, and stays hassle free in any kind of weather. And FireLine is as durable as it is versatile. It won't deteriorate over a lifetime. Ultra-light rays or sunlight won't affect it. And neither will the cold. No other line delivers this combination of easy handling, castability, super strength and sensitivity. And no tackle box should be without it.