The Karst Stone Pen is thoughtfully engineered to complement the Karst writing experience. Swiss-made and crafted with 60% calcium carbonate—the same core material used in Karst Stone Paper—it delivers exceptional weight, balance, and writing comfort. The hexagonal body promotes a natural grip during extended writing sessions, while the matte finish and integrated steel clip provide a refined, everyday-carry design. Designed to feel substantial in hand, the Stone Pen is approximately 50% heavier than standard plastic pens for a premium writing experience. At its core is the Floating Ball® black ink system, engineered specifically for Stone Paper. It delivers smoother ink flow, bolder lines, and ultra-fast drying performance, drying in as little as 1–3 seconds on Stone Paper while also performing exceptionally well on traditional paper. With a writing distance of up to 5,000 meters, the Stone Pen combines precision engineering, premium materials, and everyday reliability.