Fantastic - solved a poorly starting nib in minutes!
I bought this pack to solve the "baby's bottom" issue on a poorly starting MB nib. It worked so well and wound up writing so much more smoothly than before, that I then used the kit to polish a few other pens for smoother writing. A word of advice: counter to some youtube videos, I wouldn't suggest starting with the coarsest first. Try starting with a mid-coarse pad (3600 or 400) and working to the finest (I did 4 figure eights, and 4 infinities on each), as I found that on the one pen that I took across all 9 pads in the pack led to slightly overly-aggressive polishing, and resulted in my medium-fine nib now writing on the wide side of medium. But, this was down to me (live and learn!), not these excellent micro mesh pads.