These are the actual cover ideas that Steve sent into DC Comics for the Batman Detective 1000. You'll notice the first page, top corner is the one that was used.
Size: (2) 8½x11" pages - acid free paper
Medium: Pen and artist pencil
There are xerox lines on the page, but the sketches are original. Steve has a page of boxes ready to be copied and used for cover ideas, so the boxes are not hand drawn.