Replacement Spiral Balance Question

A home owner says:
I need four replacement spiral balances for two 20 lbs. windows. Currently the plastic tip is white. Red would appear maxed out. Should I use blue?
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Tom from SWISCO responded:
I see you're looking at our S600-20 spiral balance. Is that what you have? If so, then you should definitely use the Blue Tip for a 20 pound sash.
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