After I just bought these pens the ink would run out on me every other word. I tried shaking them warming them all the methods and my newly bought pens were no longer usable. I quickly threw them away 1 day after I bought them .
I absolutely love these pens they right smoot circumference is larger so it is easier to hold in your hand with less cramping that happens with smaller pen. I highly recommend these pens! I can hardly keep them on my desk everyone in my office loves them so they disappear.