What is the 70-011 spring made out of?

A quick learner from Piscataway, New Jersey says:
Hello, I'm trying to replace several window screen on a 25' Parker the springs look simular to your 70-011 leaf spring. Are they made in a stainless steel material ? Most of the springs are rusted and no longer function. Thanks Bob.
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Tom from SWISCO responded:
Thank you for posting! Yes, our 70-11 leaf spring is stainless steel.
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