Pentel Knock Gel Ballpoint Pen Energel X, 0.5mm Needle Tip Black Ink, Lime Green Body (BLN105K-A) Pentel knock gel ballpoint pen Emerge x, 0.5mm needle tip black ink, lime green 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: BLN105K-A