This is quite possibly the most over-engineered pen I’ve ever come across, and it looks like it’s straight out of a spycraft lab. The Hancept Zero Mk2 is a 2-mm-thick contraption that can slip into a credit card slot, and magically fold into a hexagonal pen in a snap.
Definitely not designed for long-term writing. I can already imagine the sharp edges digging into my fingers. Even with my calluses, I don’t think it would be nice to write with.