The 849 KLEIN BLUE® Limited Edition ballpoint pen from Caran d'Ache is dedicated to a special colour: an incomparable ultramarine blue known as International Klein Blue. The colour was patented in 1960 by the French artist Yves Klein and is characterized by an intense glow and a special suction effect. The ultramarine-coloured ballpoint pen made of lightweight aluminum with metal clip and button is equipped with a CDA Goliath ballpoint refill in medium blue and comes in a slim case including magnetic closure.