The Woodgrain Millwork 9/16" x 5-1/4" x 96". Primed Medium Density Fiberboard LWM 45 Crown Moulding is used where walls meet ceilings. Primed Medium Density Fiberboard LWM 45 Crown Moulding is the best way to add interest to any room or space. Crown mouldings come in a variety of sizes and patterns and can be combined to create one of kind moulding buildups.