"LEAD CORE" Trolling Line. Mason is proud to introduce Lead Core Deep Water Trolling line. This fast sinking line is composed of abrasion resistant Braided Nylon over a flexible lead core. It is color metered every ten yards with non fading dye for exact depth control. This smooth and easy to control line is a must for every deep water fisherman. Available in 12 to 60 pound test. Also suggested for fly fishing.