Seaguar STS Fluorocarbon Leader gets to the fish faster and holds its own in a fight With a lower refractive index than monofilament, it is significantly less visible underwater This genuine 100% fluorocarbon leader material delivers incredible abrasion resistance Maximum impact and knot strength, all with a smaller line diameter than monofilament STS Salmon is offered on 100-yard spools in 20, 25, 30, 40 & 50 lb. test