Pella Impervia sliding window in black aluminum finish, measuring 59.5" wide x 47.5" tall. Includes one-over-one do-vent/fixed sliding configuration with annealed Sun Defense glass, argon gas fill, visible transmittance of 0.49, and a solar heat gain coefficient of 0.21 for improved energy performance. Item is in like-new condition and comes in original box. No damage or missing parts reported. Impervia windows are known for their durable fiberglass-reinforced composite frames resistant to rot, warp, and extreme temperatures — a premium option at a fraction of retail cost.