Kyocera Ink Water-based Refill, 0.7mm, Blue (C-307-BL)

The Kyocera ceramic pen writes smoother than any other pen. The ceramic tip makes all the difference.The only down-side is the expense.

I bought this pen because it felt good in my hand and the description of how it performed was interesting. At first the ink flows very well, then after a few days use it becomes spotty and scratchy. Since flow was one of the reasons I purchased the pen it was disappointing.So, giving it a second chance I decided to order additional refills, thinking the first one may have been a dud. I was wrong. The new ones did the same thing.Thankfully the pen takes a standard uniball Signo refill which are very reliable.