Window channel balance

A quick learner from Westerville Ohio says:
They are identified as BSI 30 3031 inches long metal end to end. Looks like your 351 product? Or 390 or 395?
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Emily from SWISCO responded:

Hi there!

It looks like you have either our S351-31 , with a 15-002 bottom attachment, or S390-31 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need.  You'll also need a spring strength option of 3030. 

If you have any further questions just let us know! 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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