Box states you can put the plexi terrarium in the top rack of the dishwasher, but i would not recommend placing any vintage plastic in a dishwasher. Dimensions: 12 tall :: nearly 10 diameter at the seam where top and bottom meet.Feel free to convo if you have specific questions. All of our items are used/vintage pieces that have wear consistent with age. We always do our best to show and/or describe all of the vintage characteristics. This item is made of plexi and lucite.