The listing, Uni-ball refill has ended.
Had to always have a black pen in all the charting I had to do as a nurse. I'm hoping this Pen still exists. I go for the colored ink ones now. Gel refill never opened, tip of pen covered and protected Bold 1.0. I am not aware of a expiration date on pens or refills. I know the ones I draw with and stay open a bit empty out fast and at times dry out. If this doesn't work in the pen, if in fact you have this pen. I will gladly refund your credits.