Seaguar STS Fluorocarbon Leader gets to the fish faster and holds its own in a fight Delivers the knot strength, abrasion resistance, and near-invisibility needed to target finicky trout in the world's most challenging waters Rocks, laydowns, brush – this line comes through the hazards more reliably than monofilament, and despite its smaller diameter STS Fluorocarbon offers greater impact strength. Great in current; sinks fast to get your bait into the feeding zone quickly Seaguar is the inventor and world leader in fluorocarbon fishing lines and leaders, trusted by today’s hottest pros and anglers of all species