Hi Ladies,

I think the anwer to this question is 20ml. Once I looked up the manufacturer (rolls eyes) and they make the AimStick brand in the US and these are the same. So you can look up the manufacturer or if you see any of those HPT Comparison charts with AimStick on it, I am pretty sure it is 20ml. HTH.

By the way, I used these and I think they are fine.