This item arrived in June of this year. I purchased a set of 120 colors out of the 262 available, so the missing numbers are likely due to that. I accidentally ordered two sets, and they both arrived. One set is working fine, so I think this one will be okay too. The product description on the website stated that the thicker tip is 6mm and the thinner tip is 1mm, but the thinner tip seems a bit thicker than that. (These are not brush pens) These are imported products, so please understand this before purchasing. I will ship them anonymously in a box.