A: Writing length 4 times, direct injection ink storage, capacity upgrade, 4 false neutral pens
B: Japanese MIKUNI ink, bright and full
C: 0.5mm spring bullet, not easy to leak ink
D: Not easy to fly white and break ink, and writing is smoother
E: The pen dries quickly, it is not easy to break when it comes into contact with water, and the writing is durable and not easy to fade
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