I am looking for the specific type of bolts used in QX series frames.
The only spec of bolts related to the QX frames that I found is this titanium bolt set:
they aren’t what comes on the QX… at least i hope not.
Unicycles use pretty standard bolts. If you need to replace one, take an unbroken one to a hardware shop. Ask them for M6x34mm and they should know what you want.
I would guess the regular bolts are steel or aluminium.