I'm looking for replacement

A home owner from NJ says:
There is a number on the spring 6cb is that the lbs ?
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Lauren from SWISCO responded:

Hello, thank you for posting,

Yes, the number on the metal coil indicates the weight option. Please start by reviewing the style and dimensions of the S140-6 coil balance assembly to see how it compares to your original. One assembly on each side will support a 12 pound window sash. Let us know what you think and if you have any additional questions! 

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