This flag system is great for striking fish. The flag can be adjusted for different lures and speeds by simply clicking the adjustment lever up or down. You can use your flag so that when a fish strikes the flag will go down. If you prefer, in seconds, you can easily set your flag to go up when a fish strikes. The Church Tackle Double Action Flag System is easy to install and use. Made of super tough nylon, flexible enough to tie a knot without breaking. Great for walleye, bass, crappie, and other light striking fish.