If you are looking for a really funny gift for a Math teacher you love this is the gift! "I'm a Math Teacher of Course I have Problems" is just such a fun gift to give! To personalize this gift with a custom name at the base of the glass is free. Just be sure to add the custom name with your order and if you have any questions at all private message me. Each glass is hand painted so if you have a request for a change on the design let me know, I love making gifts more custom so that it is the perfect gift specially for you and those that you are giving to! This glass is 20 oz. and comes with a care card and in a clear gift box.