Spirals for a jend-weld window

A quick learner from USA says:
Hi,
I need two special balances.

My balances are 23" by 3/8 and the sash is 29lbs

This does not include the hooks, just the cilinder. There is no color mark on the tip.

Please advise on what I need. The look like S900-23 yellow to me

Tks, F.
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Emily from SWISCO responded:

Hello!

I agree with the Series you picked out. Our S900-23 looks like a good bet as long as the outer tube diameter is 3/8". You would also want the Yellow tip based on your sash weight.  A pair of balances with this option will support a sash weighing 24 to 34 pounds. 

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