These reeds are made of stainless steel, on nickel silver plates and are Richter tuned. The Seydel 1847 reed plates are suitable for the Seydel 1847 Classic (wooden comb), 1847 Silver, (not suitable for Silver+ harmonica) Noble, Favorite and Solist Pro harmonicas.
Keys: LLE – F have stainless steel reeds, and keys F# – HA have brass reeds.
If you require 1847 Silver+ reed plates, choose Session Steel plates – these are recessed into the harmonica comb.
Seydel video on changing reed plates.