Pentel Knock Gel Ballpoint Pen Energel X, 0.3mm Needle Tip, Red Ink (BLN103-B) Pentel Knock Gel Ballpoint Pen Energel X, 0.3mm Needle Tip Red Ink, Red Body Smooth Gel Ballpoint Pen, Energel from Japanese stationary brand Pentel. Now Energel is available as Multi-Function or Mult-Color pen and also affordable series Energel X Model: BLN103-B