replacement balance springs aluminum windows

A handy person from Houston, TX says:
I need 12 balance springs for:
Tilting aluminum windows
29" balance spring length
3/8" balance spring diameter
18 lb window sash weight

What spring do you recommend?
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Tom from SWISCO responded:
Good afternoon, and thanks for posting! It sounds like you have our Series 900 spiral balance. Please see our S900-29. I recommend the red tip option, which can support a window sash weight range of 10 through, and including, 22 pounds.

Please keep in mind that the weight range information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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