It doesn't come in a box.
Thank you for your recent inquiry with The Home Depot. This does not come in a 12 ft. length. We appreciate your business and look forward to serving you in the future.
I have the same question. Did you get a response?
I used the Mantis ones, they are coated steel. I felt they were stronger than the plastic ones from trex. Hope that helps.
The specifications are correct. This replaces a deck board and deck boards are 5.25 inches in width.