I could figure out the size correctly with the dimensions given. It was much larger than I expected and the profile was very pronounced. I had to return it.

Very expensive for 78" of designer crown molding

Moulding looks great. I chose to add backlight. Install was easy. I added a 1“ strip of foam board that o tacked to the wall during install to maintain an even gap to the wall. Material was easy to cut with a miter saw. Also I reduced the bottom of the moulding by 2 inches to by running through a table saw-I would have looked too big on the wall otherwise. I glued the pieces to the ceiling with a glue that is made for foam, held it in place with 8ft floor trim until the glue dried. Final steps were paintable caulk for all small gaps, paint everything with same latex paint I used for the ceiling and glued an LED strip behind.

Cheap looking. Didn’t end up using it. I had high expectations though.

Excellent crown moldings, which make the ceiling look higher. They are easy to install.