4-1/2" Style 3 vaulted foam crown molding thats easy to install! No nails or fasteners. Put a bead of painters caulk on the top and back surface, press to the wall and ceiling. Wipe off the caulk on the seams. Install the molding and caulk the seams in one step! This molding will work on ceilings with angles from 90 - 135 degrees. Works on vaulted, sloped and cathedral ceilings.