This was my first time ordering any sort of polycarbonate material, so I did a bit of research first.  I ordered them to nail into the door and wall where my dog jumps up and (previously) scratched the wood and paint.  They're thin enough to where the edges don't catch her paw pads/nails but they're thick enough to protect the wood and paint from her nails.  The clear is great, though shiny.  I would definitely recommend these sheets!