Use our synthetic Polyurethane Casings for both interior and exterior applications. Use around doors, windows, and other openings with Corner and Base Blocks for simple installation without miter (angle) cuts! (Upgrade Blocks to PVC to for exterior use.) When ordering Casing, please request your free copy of our step-by-step installation booklet, Casing & Baseboard Installation System.Read more about Polyurethane...