Two different materials are used to make erasers: rubber and plastic. All erasers and most plastic erasers from Faber-Castell are PVC-free. Faber-Castell's PVC-free erasers do not contain harmful phthalate plasticizers. It has been reported that phthalates can cause several undesirable effects when exposed to the human body. The balanced plastic blend ensures a soft and smudge-free erasing experience.