I have these numbered pins and I use them but I'm not thrilled with them, especially for the price.
Maybe I just got a bad set, but on mine, several pins had burrs I had to sand down, and some of the numbers are only partially printed and/or are smeared. Also the numbers are only on one side, which is annoying.
Also, these pins aren't steel - they don't stick to magnets. Since all of my pincushions are magnetic, this also annoys me.
I wouldn't buy them again. I would probably just mark flower-head pins instead, if I didn't already have these or if I had it to do over.