28 inches long metal end to end. No legible markings.

A handy person from Southern California says:
No markings available. I would like to know which channel to buy. Thank you.
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A handy person from Southern California says:
Your series 385-28 channel has little "ears" on either end of the plastic tips. My channel doesn't have the "ears." There are slight differences in appearance and would like to know if it is compatible.
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Lauren from SWISCO responded:

Hello, thank you for posting,

It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. 

The metal channel should have a number stamped that indicated the spring stamp option. If there is no visible number present, you will need to obtain the weight of the window sash and compare to the strength chart on the product page to choose the correct stamp option.

Please review and let me know if you have any additional questions! 

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

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