Replacement Non Tilt spiral balances

A quick learner from Ft Myers, Fl says:
I need to replace the balances shown in the attached picture. The rod is 30.5 by 3/8?. There is no color tip.

Do I by the the 400 series? If so the 30? or the 31?.
What color tip as there was no tip on the ones that I removed.

Thank you,
Debbie
spiral balance tip
Profile picture of Paul
Paul from SWISCO responded:
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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