Pieces of broken pottery (sherds) are often found in shell mounds and in sand dunes of Seri country that attest to the remarkable skill of the makers. The type is referred to by archaeologists as "eggshell" pottery because it is extremely thin. At the same time it is hard, fine, and strong.
The making of this quality of vessel has not been witnessed in historic times. Whether its decline was caused by the makers' moving away from their source of fine clay or by a necessity for hurried manufacture because of the rapid moving of camps in historic times is not known.
As importation of metallic and other alien types of vessels has increased, Seri pottery has ceased to be produced. Today, there are only a few potters who make an inferior product for sale to tourists.