I can't believe you posted this, mits, it's been on my mind from the other thread this afternoon.
I went to Amazon too, it's confusing because most of the sellers don't indicate the tip size. Just for information purposes, Micro Mark sells these in 3 sizes for about $10/100 pack (that's where I got them last time around). Next time will be Amazon for me.
I'd love to get the 400 pack for $25, but no idea about tip sizes. Most of the Amazon vendors don't list the tip size, but a handful do. Cheaper than Micromark by a couple bucks.
I'd never considered painting with them, thanks for the tip (from the other thread :) )
Kizzy, I would think for the tiniest job, the smallest tip would be best. I have all 3 of whatever it is Micromark is selling. They indicate regular, fine, and extra fine, probably 1,2,and 3mm. I think all 3 sizes are useful.