What is the 70-011 spring made out of?

A quick learner from Piscataway, New Jersey says:
January 17, 2012
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:
January 18, 2012

Thank you for posting! Yes, our 70-011 leaf spring is stainless steel.
Leaf Spring
Leaf Spring
70-011
$0.46
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