My understanding is they initially got their shape from being pressed tightly into a cigar box (hence the term box pressed) with their brethren after being rolled. Needless caveat: someone please correct me if this is incorrect. :laugh:
I'm just guessing on this but with the popularity of the shape, I'm sure some makers have begun using other methods to get the shape prior to their being boxed. Anyone have info on this? Personally, I like the shape of box-pressed cigars.