Paul from SWISCO responded:
March 1, 2018
Thanks for reaching out to us, Debbie. We'd like for you to go ahead with a 31" balance, our S400-31 spiral balance to be exact. When viewing that product on the site, you will notice a sash weight range chart below the product description. Based on the weight of your window sash will determine which colored tip option you will choose when ordering a replacement.
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