I have these JBL L100's (my 4th pair so far) and am wondering what exactly these type of covers are. I was told they are called Fretwork. They are a mesh of a material similar to wicker. They appear original to me mostly due to the perfect condition...not a DIY job. I did not know (not that I'm an expert by any stretch of the imagination) L100's could be bought with this type of cover as all the others I've seen were foam. 2 jpg's are attached.