Tall enough for 3 layer cake.  Wide enough for 9 inch round iced.  Have had this item for 4 years without breaking and we use it a lot because it sits on our island and we put left over baked goods in it all the time so we don’t forget about them.  I was happy to find it on Wayfair for a great price to give to my daughter.  You do want to handle it carefully when washing.  Obviously it’s been washed many times in 4 years and we haven’t broke it.  A lot of other people’s “breakage” issues must be related to a lack of careful handling.  I have granite so I sit the dome on a towel when I take it off.