Frister & Rossmann is a German manufacturer of sewing and embroidery systems. Here are some details about Frister & Rossmann sewing machines based on the search results:

Positive:

• The Frister & Rossmann Professional Quilters Edition QE404 has many features and comes with a bundle of accessories and freebies.
• The Frister & Rossmann Cub 4 is a lovely vintage sewing machine.

Negative:

• The instruction booklet of the Frister & Rossmann Professional Quilters Edition QE404 has spelling mistakes and bad grammar.

Materials:

• No information was found about the materials used in Frister & Rossmann sewing machines.

It is worth noting that the search results mainly provide information about the features, reviews, and history of Frister & Rossmann sewing machines, but do not provide information about the ingredients or materials used in their production.