Spiral balances

A handy person from Florida says:
Hi, I'm looking for 3/8" spiral balance for non tilt old aluminum window. length is 17" and although it looks like the plastic tip was once white, I weighed the sash and it weighs 11.34 lbs. Should I go with red tip balance?
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Emily from SWISCO responded:

Hello there!

Thank you for reaching out to us. Yes, the red tip would be appropriate for your sash weight. A pair of S400-17 balances will support a sash weighing 6 to 17 pounds. 

Let us know if you have any other questions!

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