TWSBI Diamond 580AL Silver Fountain Pen - Clear with silver aluminium trimA pure demonstrator with clean silver accents The TWSBI Diamond 580AL Silver strips the design back to show you all the inner workings. The crystal clear body, with silver aluminium trim, gives you a neutral platform to let your ink become the main character. Based on the proven 580 model this 580AL adds the upgraded grip and silver piston system for a more elevated feel. What sets it apart Piston filling system, with higher ink capacity than