"These are wood blinds that utilize my helical gears that are made with the gear making technique I developed. The blind slats and the frame are walnut, the handles are pecan, and the gears and pulleys are made of cherry. Visit my web site for more information http://www.stevengarrison.com , and also be sure to check out my other videos here. Thanks for watching!"

From http://www.boingboing.net/2009/02/16/wooden-geared-window.html ...