Acoustic line lure accessory producing the "NATURAL SOUND" of underwater prey. Each ball is a waterproof sphere with two inner chambers, equipped with three stainless steel pellets per chamber to produce a constant subtle sound to attract fish. Sonar Ballzz can be combined with any live, 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.