I picked these up at the range last week -- they are once fired LC '13 brass. Clearly, these are from the deflector on an AR. This is after cleaning and resizing. Everything I have seen online suggests not using ones with a crease, but a ding is OK. I don't have enough experience to determine if these are "dented" or "creased". I'd be using these for plinking loads (1200-R and 55gr FMJ) in an AR.