Going by memory, as much as 1/32 in width. I had ordered it 3/4" wide. As for thickness, probably half that- 1/64". Not bad, really, when you consider that they probably use razors, as is done with balsa. This task required much tighter tolerances than model airplanes, which is their main business (I think). I ordered it 3/32" thick (.1875"), knowing that I was going to thin it down to the saw blade width, which is .140".

Steven- Random Orbital Nailer