This mold makes excellent large square bars. The inside of each cavity is smooth, with crisp corners and sturdy sides. The bars came out looking smooth and shiny. When unmolding, the sides were easy to pull away, and the airlock was easy to break. The large size makes it perfect for a decent sized batch of soap, without being so large that the filled mold is difficult to handle. Deep enough to do some layering, simple swirls, or embeds. Certainly a must-have basic mold for any soaper.