Caran d'Ache consumables
Cartridges, converters, and refills from the Swiss firm Caran d'Ache. Due to their size, shape, and, most importantly, their barrel diameter, Caran d'Ache converters and cartridges are considered "standard" or "universal" refills, making them suitable for use in Caran d'Ache fountain pens and those of other companies, if they are compatible and meet these standardized measurements.
