Babean, I primarily use only 8oz tumblers and 16oz apothecary jars. For the 8oz, I use a CD 10 for most of my fo's. I do use a 12 for my vanilla's, cinnamon's and other heavier fo's. For the apoth's, I double wick with 2 10's or 12's for heavier scents. No mushrooming, no torches and great throw.:yay:I must say though, that I don't use dyes, so I think that makes a difference. I think that those who use dyes actually start out w/12's and wick as high as 16 or 18. HTH Edit - I just saw a post on the Scents section and RS said she is getting hang up with the 12 on her vanilla. I've been using the same wicks for a couple of years and don't get any kind of hang up- must be the good ol' West Texas air. So you may want to start w/12's and 14's Kathy (Also, note that I made an error on that post. I meant to say that I get wet spots, but not frosting)