The Bayou Rattler Products Sonar Ballzz are an acoustic line lure accessory producing the "natural sound" of underwater prey. Each ball is a waterproof sphere with two inner chambers, equipped with three stainles steel pellets per chamber to produce a constant subtle sound to attract fish. Sonar Ballzz can be combined with any line, dead, or artificial bait to enhance your presentation with a natural sound. Add to your line at any point, inside soft lures, worms, or to any jigs or rigs. Proven effective in saltwater, fresh water, ice or fly fishing.