Mosquito Control Rings， Set of 20<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Control mosquitoes naturally</li><li>Rings last for a month</li><li>Each ring， placed in water， controls 100 square feet of water surface area， no matter how deep</li><li>Can be stored in a dry， cool area for up to two years</li><li>Rings measure 2-1/4" in diameter by 3/4" thick</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51VU7sdFMqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51kjVk51FzL.jpg" noproxy>