The maximum ball size is 22cm inside diameter. This is a convenient cooking bowl, not a 100-yen store item. This is a recycled item, so please check the condition (images) carefully as there are scratches and stains before purchasing. I do not respond to comments or price reductions. I have cleaned and shipped it in a clean condition. There are no dedicated boxes or accessories. It will be shipped simply. It has been disinfected, but if you are concerned, you may want to sterilize it with boiling water before use. Thank you.