On the shelf stock ones will last about a year. A wareness of the fact that water bends the light rays and refracts light a prism is helpful in understanding how attractors pull fish into your spread. Spread is the term for amount of baits you're trolling. The lateral line of a fish is sensitive to any movement in both a defensive and offensive posture. As an attractor stirs up the water and can signal to a predatory fish that dinner will soon be served through the sensors in the lateral line.
Turbulence is an often overlooked factor.
Let's not forget about the added flash and light reflection in an otherwise dark environment, oh let's say 70 foot and deeper. Remember sometimes you have to walk in the darkness before you'll see the light. Hopefully, you won't be in the dark for very long. The truth is that fish can strike something they can't see or feel, always keep this in mind. Cowbells or Lake Trolls Cowbells are a string of large rotating flashing blades.