Pentel Knock Gel Ballpoint Pen Energel X, 0.5mm Needle Tip, Black Ink (BLN105-A) Pentel knock gel ballpoint pen Emerge x, 0.5mm needle tip black ink, black body Smooth gel ballpoint pen, Emerge from Japanese stationary Brand Pentel. Now Emerge is available as Multi-Function or mult-color pen and also affordable Series Emerge x Model: BLN105-A