Big air bubble in a ballpoint standard Muji pen. Pen experts

MUJI 0.5mm Smooth Gel Ink Knock Type Ballpoint Retractable Pen Black color set 10 Pieces Set with Original Pen Case : Office Products

Body: Polycarbonate 0.5mm Point Gel-ink ballpoint pen with a frosted body for writing or drawing Water based ink that dries quickly and doesn't bleed

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