FireLine is a thermal filament fishing line, not a mono nor a braid, but fused Dyneema Line. It is made from MICRO Dyneema, the world's strongest fibre line, which has lots of smaller fibres bonded together to deliver the best performance line and power!  Available in test bs of 14lb and 20lb. Colour - smoke.  300yds
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Fireline from Berkley is billed as the strongest, easiest to cast superline on the market and fully deserves its reputation.

Unlike braided superlines, Berkley Fireline uses dozens of strands of Micro-Dyneema Spectra fibers, that aren't braided so the texture is smooth and it comes off the reel easier.

Fireline is perfect for casting and spinning reels and will not get the twist mono will after a hard day’s use on a spinning reel, it has virtually no stretch for ultimate sensitivity and hooksetting power under all conditions.

The thin diameters (less than half the diameter of same strength mono) allow lures to reach deeper depths and cast farther since there is less friction on the spool rim and guides. Fireline is also more abrasion resistant than braided superlines and will stand up to the toughest fish and harshest conditions.

In short, Fireline can take as much abuse as you can dish out and still bring in the fish.