Tackle Room Trolling Weights with Shock Leaders are the perfect way to get started high speed trolling. Each trolling sinker is rigged in our warehouse, in the USA, using first rate materials and practices. Stainless steel ball bearing snap swivels are used on both the weights and the shock leaders, to ensure smooth and tangle-free operation. Each kit includes a shock leader, consisting of 250lb smoke blue mono, 25 feet in length. All loops feature chafe protection to ensure maximum life of service. Use trolling weights and shock leaders when targeting King Mackerel, Wahoo, Mahi Mahi, and other pelagic species.