Which type of steel?

A quick learner from Pacifica, California says:
October 20, 2019
Several of the SWISCO screen clips are made from stainless steel, and specifically say so in the listing. This item, 70-005, does not indicate which steel alloy is used in it. Can you clarify the point? We've got coastside corrosion conditions here and are really hoping for stainless: the old tension springs have rusted away to pretty much nothing!
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Paul from SWISCO responded:
October 25, 2019

Many thanks for your correspondence. The 70-005 Wire Tension Spring is made of steel, but it is not stainless. Let me know if you have further inquiries. 
Screen Frame Wire Tension Spring
Screen Frame Wire Tension Spring
70-005
$0.20
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