I'm so glad I ordered this when I first ordered some pens and inks and didn't wait around! It is super easy (and fun) to use and saves so much time! I use it in so many different pen brands! Also nice to squirt! & squish water into caps and barrels for a nice cleaning. I was surprised how much ink was in some of the caps and I never would have noticed until I used this bulb thing and cleaned out the caps too. It's awesome.