The Genesis System eliminates let-off on light draw weight bows (where its unnecessary) so there are no specific draw length requirements. The result is a bow that fits virtually everyone (15″ to 30″) and that a young person can't outgrow. A Genesis bow, set at 20 lbs. (it’s adjustable from 10 to 20 lbs.), stores and releases energy comparable to that of a 35 lbs. recurve! Plus, with zero let-off, it has the ‘holding weight’ necessary to ‘pull the string from your finger,’ making it easy to shoot. The difference between the Genesis and the Genesis Pro is that the Genesis Pro features a stop on the back and the regular Genesis doesn't.