The one I've got is 1/2 ml thick, I would think they would be better at least 1 ml thick. Although they say they went through extensive testing before they chose 1/2 ml. The fish hooks, needles, and awl I think are good at 1/2 ml, and might be to bulky at one ml. The arrowhead, trident, and saw could be thicker, so I guess it's a compromise.