This Four Pack Eco Retractable Bamboo Ballpoint Pens in Black, Blue, Red, and Green are 82% biodegradable thanks to a bamboo barrel. The smooth regulated ink flow prevents scratches. It is tamperproof, waterproof, and fade-proof ink. The color of the clip and base matches the color on the ink. It is 5.55" x 0.75" x 0.5" in size and comes packaged in a blister pack.