Description: Size: .0394 in. dia.; approx. 1mm<The smaller ball stylus' are great for cursive writing, lines, burning on tagua nuts and other miniatures and a multitude of other uses. It glides over the wood to make writing with this tool a snap. Because of it's small size, it is welded to the tip rather than having a wire through it. Extra caution needs to be taken when using these tips, they stay hotter longer after they are unplugged. The larger sizes can stay hot for up to 5 minutes so please be extra cautious when using them. All ball tips require a longer warm-up time and cool-down time than our other tips.