Got this for my hubby. I had gotten him the Olive Wood one previously, but he lost the insert (was able to find the outer cylinder thankfully), but he worried about it leaking, so never filled it again. So, I got this one, which had the inner cylinder, as well. He loves it, I love that the inner cylinder is attached to the lid/ring side. So if it ever does unscrew in the future, he is far less likely to lose the inner part/oil.