All the pieces are in 925/1000 silver. The handles and the knobs are in ebony. The lid of the sugar-bowl is in plexiglas. Each piece bears, in addition to the legal identification mark and the imprint of the silver title, the following engravings: mark of the Officina Alessi, symbol of the Bauhaus- Archiv, year of production, progressive numbering. There are also three artists proofs in different metals and marked P.A.