Suitable for all variety of Fountain Pens. Please note — newer "Plastic" style bottle replaces the traditional "Glass" Bottle. According to the Visconti Factory this allows for ease in stacking the ink bottles and also safety when shipping or transporting the ink bottles. The Visconti range of Bottled Inks and Ink Cartridges includes six different colors, so that every writer will find the perfect shade for any occasion, mood or feeling.