The automatic fishing reels are made of galvanized steel with a tempered spring that automatically sets the hook when the trigger is released by a fish taking the bait. Our reels are very popular for catching Crappie and Catfish. They can be attached to limbs, boat docks, the side of a boat, or any other means that will suspend the reel a couple of inches above the water. They also make an excellent device for Ice Fishing. Tried and tested for over 20 years - Simple - Durable - Adjustable Line Tension. For large fish: drum, catfish, bass, pike, set heavy, use large minnow and tight tension. For small fish: crappie perch, white perch, bream, light set, use small minnow and loose tension