The tip of TIPEN 2.0 & 3.0 refill is made from silicon carbide, it’s amazingly strong, measuring an insane 9.5 on the Moh's hardness scale. To put that in perspective, diamonds come in at 10.
 
And it’s not only made for writing. The sheer strength of the silicon carbide ballpoint tip makes it able to easily open packages, pry off lids, open cans and more. As a super pen tool, it is designed to last forever.