Eco-friendly natural stone material pen, made from a blend of 45% calcium carbonate and 55% Polypropylene, it is 90% biodegradable. Click action with a featured design of stone shape barrel, a special design of broad printing area clip which can be pad printed and full colour digital printed. Plastic Cross-Type German manufactured black ink refill, 1200 metres writing distance, tungsten carbide ball provides you with quality writing. The use of disposable plastic pens is no longer recommended as it pollutes the environment. Please note, the inside refill is made of normal plastic which is not biodegradable.