Lock corner, 1 piece box, tuck top, CCK, poly wrapped. Great for cake, pastry and pie. Made of clay-coated kraft paperboard, which is white on the outside and brown on the inside. Each one piece box has an attached tuck-in lid, and can be used to hold and carry a variety of baked goods. The lock corners facilitate assembly and enable the box to be folded flat for storage or transport. Paperboard is thicker and more rigid than paper and can be recycled or composted.