• Fine nib black ink, 1 retractable fountain pen includes 5 cartridges
• One-handed control, no cap to lose
• Sealing cover for high air-tightness, ink won't dry or leak out
• Precise ink regulator to adjust the amount of ink, ensuring clear lines and smooth writing
• Refillable design with matching cartrideges, environmental-friendly
• Ergonomic grip zone for comfortable writing experience
• Convenient small transparent box packing, can also be used as daily storage to avoid loss