been a while since I used my badger- but usually the sizes are numbered but they mean they are the fine (like thin inks), the general airbrushing, and one for crafts(like model painting w/thicker oils) - You probably want to use the middle one- since the really fine one would not work for pearl dust. Just make sure that the aircap and cone also match the size of needle. Usually they have an etched ring around the back end of the needle and the aircap end...none or one for the #1, 2 rings for #2, and so on...
In reality- you could work with any and all of the included ones. If you use pearl dust alot- you could really work with the crafts one- and have less problem with the dust. The smallest one will probably be a pain with dusts.
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