The NX 50m is the easiest size to stock in your chest pack: one spool of each useful diameter, slim profile, and enough line for common leaders. Its Japanese manufacturing and advertised strength make it a high-quality nylon suitable for both drift fishing and fly fishing. The “X” marking eliminates hesitation at the water’s edge, especially when you need to quickly re-tie a leader. From 4X to 8X, the range goes from a sturdier nylon for holding a rig to very fine sections for delicate fishing.