Ultima Power Steel is the strongest mainline leader material on the market today. Ultra strong with a phenomenal knot strength, this leader will withstand the most powerful shock from casting heavy weights. Ultima’s Intelligent Stretch technology means that you get less stretch at the beginning of the power curve, giving braid-like bite detection & hooking. Power Steel is fluorocarbon coated & therefore super tough giving great performance in the most extreme conditions. Power Steel is smooth & offers great softness & suppleness, giving your bait the best presentation each & every cast. It is very user friendly & easy to use. 4oz Spool. B/S Dia Code 10LB 0.29mm SF-UPS-10 15LB 0.33mm SF-UPS-15 20LB 0.37mm SF-UPS-20