Rovex 40lb 0.62mm Fluorocarbon Leader line in a 20m spool is as close to invisible as is possible. This clear Fluorocarbon Leader line sinks four times faster than monofilament nylon (mono) while maintaining excellent abrasion resistance. It is made from premium-grade 100% PVDF, which stands for polyvinylidene fluoride. PVDF material used as fishing leader has a lower optical density than mono, making it less visible to fish. This leader also has a harder surface increasing abrasion resistance above mono. PVDF is denser than mono, so it will also sink faster and will not float on the surface as much as conventional mono leaders. In addition this leader line doesn't absorb water and is also resistant to UV light. All this jargon simply means that when you need the most invisible leader possible, with better abrasion resistance, that sinks fast, and that is great value and will not "break your bank", then Rovex Fluorocarbon Leader line is your best choice. These 40lb 20m spools are suitable for freshwater fishermen targeting cod and small- to medium-barra in impoundments; and saltwater fishermen chasing snapper, barra, threadfin, jacks or mulloway.