Hmm -- Don't have anything to weigh in gms but I have an unfinished bowl at 3 1/2oz (wall = 1.5mm) and a finished bowl at 7oz (wall = 2mm), have to say that this is the thinnest I have turned to date. The finished one is beech, not much care taken with it as I was just playing around with thinness of walls. This tree was blown down in our lane back in the spring.