New Balances Needed

A home owner from Kauai says:
I am looking at getting new balances for 2 of our windows that the channels bust. Based upon the pictures you provide, I believe I need a 31" 380 Channel Balance. The writing that is on my old balance is: 30-4 GA2 CMC 19. What strength do I need?
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Casey from SWISCO responded:

Hello,

A 30-4 stamp would indicate your balance uses a 3040 spring strength option. Thank you!

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