Only Seaguar produces from resins to finished product. Only 5 Companies in the world make Fluorocarbon Resins; Seaguar is the only one in the Fishing Tackle Industry. Seaguar is the original fluorocarbon; this is the one that started it all. Incredible impact and abrasion resistance. Fast sinking. Superior tensile and knot strength. The blue label leader is 100% fluorocarbon leader materiel allows you to use a smaller test leader than comparable nylons or fluorocarbon for unmatched bait presentation. We have been selling this brand since SEAGUAR hit the market many years ago and it is still our best seller, period. If you are world after a record, IGFA style, this is for you, if you are after tuna of all species, this is for you, if you want the real thing this for you.