GZX1048: Features: -Ink refill. -Ultra smooth writing, free-flowing, low viscosity, acid-free ink and fits in parker and parker compatible ballpens. Pen Type: -Rollerball (Gel). Ink Color: -Black. Pack Size: -Two. Item: -Pen Refills. Dimensions: Overall Length: -8.5 Inches. Overall Product Weight: -0.16 Pounds. Pen Size (mm): -0.7 Millimeters.