I have been using the Pentel Energel pen for years with great results. Now the last 6 pens I've purchased ran out of ink (stopped writing, skipping, etc.) before the ink was all used out of the cartridge. I am very disappointed in your product at this time. I will need to find another pen that works as well as yours did. Thank you for the opportunity to state my opinion. Jm.berger
If I could, I would attach a picture to this review.