I have ordered these props for my FC40: http://www.ebay.com/itm/2-Pairs-8-8...0-/331223751440?ssPageName=ADME:X:AAQ:US:1123. Interesting that they are 8" but have exactly the same shape and twist as the 9" Vision props. I can't find any information or user experiences with these. Strange. They are supposed to be genuine DJI CF self tightening. Well, see what turns op in the mailbox this week. Can't wait to try them out. I will post a review when I have them.