The Drehgriffel Nr. 1 is a ballpoint pen made of precision milled aluminium and brass, lacquered and sealed. It contains a spring-loaded twist mechanism. To change the refill, simply unscrew the twist head.The royal blue flow refill (thickness B), which has a particularly light and flowing writing characteristic, is available as a replacement refill in the colours royal blue and black. Details: • Ballpoint pen made from precision-milled aluminium and brass • Document proof ISO 15727-2 • With ink in Royal Blue • Refillable (refills available in select colors)