2-piece plastic and fabric cover. Plastic liner stops drafts and keeps dust and dirt out. Use installation tape (included) to secure plastic liner to interior window air conditioner unit. Quilted fabric cover fits over plastic liner and adds a finished decorative look. Color: Beige. No. AC9H: Standard, fits units up to 18'' x 25'' No. AC11H: Large, fits units up to 20'' x 28''