YGK Zylon super-fibre leader is regarded as one of the strongest assist cords in the world and is known to be twice as strong and abrasive as Kevlar cord. The Zylon is extremely popular with fisherman who want to splice their assist rigs etc as it contains a completely removable filler. Not only does it have Superior strength but also minimal stretch and cut resistance for the big catch. It is fairly rigid allowing for great hook presentation and hook up rate. I must have when targeting big pelagic species like Dog Tooth Tuna etc.