Zebra F-3000 and 3000*F are rather rare pens, especially 3000*F, wich isn’t being manufactured anymore. The 3000*F pens require no modding, while the F-3000 should be modded the same way as a Bictory is. Many think they are great to spin with, and the demand isn’t filled because of the low supply. They are quite light and have a small barrel though, so they don’t fit every spinner. Also, it’s absolutely no pen you should spin if you have just recently started PenSpinning.