I received this pen free for my honest review on Amazon.  The pen comes with 4 tips.  I personally saw no difference in the tips.  The pen comes with no acetone inside.  It can be easily filled by removing the tip and pouring the acetone in.  I find that a bit messy, so I prefer to just dip the tip in acetone as I’m doing the cleanup of my manicure.  Over all, I like the design and colors and it does what it was intended to do.