What material are the stainless steel Vlier ball plungers made of?

The material of ball plungers such as SSBH62N is:

Body: 300 Series Stainless Steel
Ball: 440C Stainless Steel
Rivet: Brass
Spring: 17-7PH Stainless Steel

Finish:

Stainless Steel - Passivate
Brass - Nickel Plate

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https://anemo.eu/stainless-steel-comparison for more info