These unique little vessels (bottles) are actually blown glass on a very small scale. Each one is fully functional and comes with a small cork to seal in your favorite “potion”. I keep corks on hand for easy replacement should you lose it, or need to replace it. Average size is between 1 & 1 ½ inches in diameter and 1 to 1 ½ inches in length, not including cork. I’m not sure how much they hold, but remember- they are rather small.