Crown molding corner blocks 3-1/2" sq. and 11-1/4" long, 4 pack, smooth one piece by Austin Crown Moldng They are made extra long for vaulted, cathedral and sloped ceilings. Customer Service 512-751-4477 Great to add a decorative look into the corner of your room. Save having to miter crown molding corners. Smooth, white, high density, polyurethane material. Adheres with painters caulk to drywall, brick, block, wood, concrete, stucco etc. CLICK AUSTIN CROWN FOR TERMS AND CONDTIONS