We use the same oils in both the 2ml and 15ml bottles — the main difference is the rollerball.
What's the difference?
We use the same oils in both 2 ml and 15ml bottles.
The main difference between these two is the rollerball.
The rollerball in the 15ml bottle releases less oil, than the one in the 2ml.
You simply need to roll a little more to get the same amount of oil out of the bottle.