I ordered the 0, 00, & 0000 sizes in the extra select to build the old school style of "popper" popping bug flies for bream fishing. I needed the extra select so that when painting I could avoid pre-filling all the lenticels so common on lesser quality corks. These are truly extra select. These corks are very hard to find these days, but nothing else has the same "feel" as the cork fly "poppers" of yesteryear. They are hardly ever used any more. But nothing works like real cork! Thanks Widgetco for keeping the old school fly patterns alive. Every time I use one of them I'm drawn back 44 years ago to a young 6 year old boy fly fishing in the Atchafalaya Basin with my dad and I can't help but smile.