Winsor & Newton are committed to making The World’s Finest Artists’ Materials, so it's no surprise that their Kneaded Putty Rubbers are an essential tool for any artist. These are "plastic" or "putty" erasers, which you can mould to a fine point and use to erase the tiniest details and to pick out highlights. They're equally effective on pencil, chalk and charcoal, erasing effectively without smearing. We sell two sizes of Winsor & Newton Kneaded Putty Rubbers: large and medium.