The outside finish is mineral oil and inside is epoxy so you are able to drink hot or cold in it, i didnt turned them all small stave cut with both side with an angle and then sanded , those are 700 ml per mug 6 1/4" high
nice mugs here, very stable looking, can't help but notice that you put your logo on the front of these, It may seem strange, but more people will look at them, if you put it on the bottom, anytime that you make a bowl, or some hollow form round project, the first thing that someone that handles them will do, is look at the bottom, I don't know why, but ask most turners they will vouch for this.