Pella 250 Series white vinyl sliding window measuring 41 inches wide by 36 inches tall. Includes one sliding window unit with do-vent and fixed sash configuration. Glazing features Advanced Low-E, high-altitude Low-E with argon gas fill, 0.56 visible transmittance, and a low solar heat gain coefficient — ideal for Colorado's high-altitude climate. Annealed glass. Condition is like new and item is in original box with no damage or missing parts. SKU: WIN-ON-57902.