Sunline Fluorocarbon Leader SV-1 System Shock 50m #5 20lb 0.370mm (6626)Sunline SV 1 System Shock fluorocarbon leader material. 50m spool, size #5 (20lb breaking strength, 0. 370mm diameter). High abrasion resistance with low visibility in water. Designed for tying shock leaders or heavy duty leaders for bottom fishing, jigging, or targeting toothy species. Stiff enough to handle sharp teeth but supple for knot tying. Tougher than standard fluorocarbon for repeated cast impact. TARGET USE: Heavy duty shock leaders for