These erasers are PVC-free and therefore more eco friendly. Why is being PVC-free important? PVC (Poly Vinyl Chloride) poses great environmental and health hazards from manufacture to disposal. That new plastic smell that you are familiar with - that’s the phthalates - a dangerous class of chemicals known to cause a host of reproductive and developmental defects. They can volatilize from the PVC, and can migrate and leach into our air, water, and bodies.