65% of components made from corn based biodegradable Mirel™ material. Biodegradable “plastic” feel with comfortable soft touch grip. Fully retractable tip, lead won't advance accidentally. Smudge resistant eraser. 0.7mm lead size. Packed 12. Refer to packaging in regard to product breakdown as not all components are biodegradable. Biodegradable elements are 100% biodegradable.