The top is an old door, recycled from that aforementioned remodeling job. It is a hollow core door because that I what I had, If I were buying a door, or had the choice recycled, I would use a solid core door. The hinge is called a piano hinge and it is 72" long with the door being 80", It took about 80 screws to attach both pieces with the hinge. I used #8 x 1 1/4" cabinet screws, they have a larger head to prevent pull through.