Prime-Line H 3580 Wood Window Sash Balance, 10-Pound, 10 lb., Mill Product Description This window sash balance is constructed from steel. It features coil spring retraction and aircraft cable lifters. This type of sash balance replaces Duplex, Superior, Preset and Fabco. From the Manufacturer This window sash balance is constructed from steel. It features coil spring retraction and aircraft cable lifters. This type of sash balance replaces Duplex, Superior, Preset and Fabco. Features Used to replace Duplex, Fabco, Preset and Superior sash balances Used on wood single or double hung windows Coil spring retraction Steel construction with steel cables Aircraft cable lifters Maximum weight rating of 10 lbs USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.