As another poster, used for snow blower skids so doesn't scratch a ground aggregate decorative drive.  4 skids, 8 surfaces out of the 12 X 12X 1 piece.  Works better than the original on an uneven sidewalk. They'll far outlast the snow blower.  Understand the side cuts are rough, the piece I got was reasonable well packed but had some minor surface scratches.  Also as other posters have noted the actual dimensions are 11 3/4 X 11 3/4, didn't matter in my application.