Sakura Pigma Microns are some of the finest illustrating pens ever made. The ink flows perfectly and the metal tips are sturdy and precise. Some of the highest paid Illustrators in the world use Microns. I highly recommend them for any type of detailed work…wait for it…BUT, there is not a lot of ink in that formidably-sized barrel. The ink starts to run low just as you’ve acquainted yourself with them fully, once low, the brilliant metal tips drag and spit like any other pen. So, use these if you have the money to replace them on the regular, I would say once every week or two under moderate usage. I keep some of these with me, but I’m hesitant to use them at times, knowing their ink lifetime is limited.