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Xiaomi Mi Aluminum Rollerball Pen Official Xiaomi Mijia Metal Sign Pen Main Feature: - Reliable and durable - Aluminum alloy pen, anodizing process - 0.5mm fine point draws , consistent line - Swiss-made refills High precision metal parts - Switzerland imported refill: smooth writing and smear-proof, retractable and refillable - 0.5mm fine point draws razor-sharp, consistent lines - Handy retractable and rotatable design, convenient to use - All-metal precision connection parts, 50,000 times rotation life test