A 13'' plate is indented to hold a 10'', big enough to hold a 9'' cake, dome. The 4 3/4'' high dome is tall enough to hold a 2-layer cake. Plastic is ''cut'' like glass to make this a safer choice with no worry about breakage and it's a lot lighter than a glass piece. The 50's were a great time for plastic, they were new and everyone had to have them. This vintage plate has some dullness and a few scratches on the plate from use. The dome is in very good condition.