Berkley FireLine Thermally Fused Superline is optimized for the spinning reels to be smoother, tougher, and more sensitive. The fused 8-strand Dyneema PE fibers in the Berkley Fireline Superline are resilient. Tested against leading competitive conventional braids, thermally fused Fireline provides up to 5 times stronger abrasion resistance when compared to conventional braided lines.