iRobot Roomba 600/700 Series Brush Gears Works with Gray CHM (select 500 series)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>6 Replacement Gears for roomba 600/700 (some 500)</li><li>Works with Gray CHM</li><li>Not compatible with the red or green CHM</li></ul></div><img src="http://ecx.images-amazon.com/images/I/510vwXCil1L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51Hs%2B%2B4tCVL.jpg" noproxy>