- 4 times writing length, direct-injection ink storage, capacity upgrade, 4 overhead neutral pens
- Japanese MIKUNI ink, bright and full
- 0.5mm spring bullet, not easy to leak ink
- It is not easy to fly white and break ink, and the writing is smoother
- The pen is quick to dry, it is not easy to smash when it meets water, and the writing is durable and not easy to fade
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