Window balance type?

I've attached several images. I have Series 385, because it's more than a inch compared to the Series 380.

What stamp option weight range do I need? I'm guessing the 9-15 lb at 2320?( from the marking on the balance itself?

The balance is 24 inches long, half inch wide.

Thank you for helping me identify the right balance replacement. I need 4, for two windows.

And thanks for such a great website! This makes it super easy for do-it-yourselfs to find the right parts!

Thanks
Matt

I weighed the sash and it's 26 lbs. I answered my own question.

I search around the forum and found the answer.

As a home owner I'm not familiar with all the jargon but if some of the replies in the threads where just put on the product pages that speak to sash weight ... like " okay this is really simple, just use your bathroom scale and weigh the window you just pulled off the wall, that's your weight, I would have not have to search and probably less people would post the same questions.

Anyway, this is an incredibly user-friendly site and I'm really impressed how easy it was to fix my own windows!

Cheers
Matt