BOOX Pen’s nib, customized by Wacom, is rather stiff and thin similar to a pencil’s while its maximum bearing pressure is only 500gf load. If you use it with hard pressure, it would be highly possible to broke the nib. You are suggested to ease up on your stylus pressure while writing. If you press hard, you will likely need to buy replacement nibs. This pack of 5 comes with a nib removal tool.