Since it was first developed in 1963, the highlighter pen has become an essential tool for the office and school. Unfortunately, like so many of the products that have become indispensible to modern life, the felt-tipped plastic highlighters are terrible for the environment. Enter the Eco Highlighter Pencil from Stubby Pencil Studio, a 100% biodegradable highlighter that uses no ink solvents or volatile organic compounds. Effective and long-lasting, the pencil marks don't bleed through thin pages like traditional highlighter ink. We don't see any information on what kind of wood is used for the pencils, but it's safe to assume they have a smaller footprint than conventional felt ones.