This plastic is 1/8" thick and solid. The thing that you need to know is that the box is tapered from the front to the back in height and width. Inside height dimension in the front is approximately 2-3/4" and the back at 2-3/8". The width of the box is also tapered with the inside front dimension being approximately 7-3/4" and the back at 7-1/4". The length to the outside of the flange in the front is approximately 9-3/4" and the back is 9-1/8". The depth (front to back) dimension from the outside of the flange is 8-3/4" straight across (no taper). It is a very solid box with a mild textured finish that looks good. I needed the box for something that was rectangular shaped and the height and width of the taper in the back of the box interfered with the fit so I couldn't use it but it looks like the box would accommodate most common radio sizes but wanted to mention the taper and outside dimensions of the flange so that you can take that into account if needed for your project.