Maximum insert dimensions: 10 7/8 x 17 3/8; Sleeve exterior measures 11 1/8 x 17 5/8. Features a standard 1/4" opening drop with vertical/portrait orientation on the short side. Constructed from 6 mil clear vinyl with an adhesive rear that utilizes a peel-and-stick method suitable for most smooth surfaces. As the manufacturer, we produce custom sizes, materials, and configurations to your specific requirements.