Fine nib black ink, 1 retractable fountain pen contains 5 cartridges One-handed operation, no cap to misplace Sealing cover for excellent air-tightness, ink stays moist and leak-free Accurate ink regulator to control ink flow, delivering crisp lines and fluid writing Refillable design with compatible cartridges, eco-conscious Comfortable grip area for a pleasant writing feel Handy small clear box packaging, also serves as everyday storage to prevent loss