The Ultrafold is a unique and versatile folding machine, capable of folding paper measuring from 3" x 5" to 14" x 20", at speeds up to 41,000 sheets per hour. This machine boasts six folding options--single, letter, fan, French, double-parallel and double-letter--and can accept all weights of stock up to 65# cover. As you can see, there is little the Ultrafold cannot handle.