Here is a link and here is another in the case that you don't know what I am talking about (I would not have yesterday). A light bullet-proof material that could possibly be used in quad-opters soon. It is called graphene. According to a few articles that I have read it is pure carbon, possibly bullet-proof and strong. I believe that because it is used on commercial aircraft it could soon be an upgrade from the current carbon-based products available. Could this be one more push toward better quadcopters and possibly militarized (not necessarily weaponized) mutirotors.