I was looking for pens to use on photographs so I tried out the sample in the store. It seemed perfect. The pens I took home however gave me uneven thickness when writing and kept dropping little dots of ink in the middle of letters. I tried each one in turn with the same result. Maybe I got an old pack and the ink was starting to deteriorate. They went back for a refund which was much more painless than trying to write with the pens.