Window Balancer - 25 x 9/16 which is 1/2 inch. 24 4 marked on them.

Thanks for posting. We can help you replace this balance, but it will have to be a custom order due to its unique configuration. We need just a little more information to be able to help. Can you show us a clearer picture of the clip at the end of the nylon cord that rests within the balance's nylon shoe? The style of that clip will help us narrow down the right replacement. Many thanks.