Are the spiral balancers sold per piece?

A home owner from Clifton Park, NY says:
Are the prices for the Series 600 Spiral Balancers listed on your website quoted per piece, or do the balancers come in pairs? I will need to replace two balancers per window on multiple windows. Thank you.
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Paul Sr. from SWISCO responded:
The prices listed for Series 600 spiral balances are per individual balancer.
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