The dimensions for the interior of the urn box is the standard size of 9" length x 6" width x 6 high the box will also have a 2 part conversion varnish on it. Engraved names plaques can be added as well. The urn box that is in the images is made with black walnut and midnight blue pigment, it also has a satin conversion varnish. This item is made of epoxy and live edge wood.