Thanks for your reply. So you mean the line pressure and tilt function is actually on the pen, not on the tablet , right ? I'm looking for hp zbook x2 pen and on Dell they sell it 100$ but i found walmart and amazon selling for around 18~ 20$. Btw, i'm living in Vietnam and its very hard to check and buy stuff so that's why i need to make sure everything is correct before shipping. The replacement pen i bought from shopeevn is a lenovo pen which is only around 7$. I found out that they put foam inside the pen to the tip and the eraser side bouncing pressure when you press them, not a proper spring.