The Downrigger Weight Cannon Ball is hand-poured and molded right here in Canada. Our downriggers are typically used in large lakes at great depths while trolling. They are used in conjunction with a downrigger rod and reel with a depth finder. The downrigger sets at a certain point in the water, while your line is attached by a snap. When you get a fish, the line releases itself from the downrigger for you to reel it in! Coated with rubber so it won't scratch your boat!