This is a set of Mitsubishi Dermatograph (paper-wrapped) pencils. Rather than "slightly scratched or dirty," it's more like the black pencil has been used one level, and the white pencil has been used a bit. Other colors seem to have been used a little or not at all. https://www.mpuni.co.jp/products/pencils/color/dermatograph/7600_7610/7600.html