It has high knot strength and abrasion resistance while at the same time the diameters are incredibly consistent. The higher density of fluorocarbon means that it sinks up to five times faster than monofilament, avoiding any fish-scaring wake. Due to the low refractive index of fluorocarbon, it becomes almost invisible under water. 50 meter spools offer anglers superior material at a low per meter price. Practical snap-lock-rotate spools with color-coded silicon retainer bands make the tippet spools easy to handle. Available on 50 meter spools in 7X to 0,405mm. 0,435mm to 0,52mm come on 30 meter spools.