What color tip?

A quick learner from Lansdale, PA says:
I have window sash that is 33 high * 31 wide. Weighs approx 17 lbs.Current spiral balance is 3/8 wide by 30inch long. What color tip? Would it better to buy the strongest colored tip for better efficiency?

Thank you
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Tom from SWISCO responded:
For your balance I recommend the Green Tip. The Yellow Tip likely will not work for your window at all, as it will be too strong.
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