The word "composition" is a term for the material in antique doll bodies, a mixture of a variety of substances and glue.  They were marketed as "unbreakable".  We know now that this was not quite true.  With the availability of modern materials, however, Seeleys/NYDP were able to formulate as composition that is truly unbreakable and has the look and feel of the old. (source Seeleys calalogue 1998)