The cases are sheet metal with wooden side panels, and a fiberboard or Masonite bottom cover.
In 1916, the company introduced Homasote, a versatile fiberboard made from recycled materials, made by the Homasote Company in West Trenton, New Jersey.
Their family-owned company manufactured fiberboard, later adding a type of resin laminate named Spauldite (to compete with Bakelite) and fiberglass tubing to their product lines.
He then moved to Scheuerfeld where he acquired the Berger paper mill and began the "Deutsche Duroleum Gesellschaft", making fiberboard plates again.