Pilot Acro 13635 Acroball 1000, Black Ink, 0.7mm Fine, Ultra-Premium Ball Point Pen. Introducing the new gold standard in Ultr-Premium ball point pens. Featuring a tungsten-carbide tip, and smooth, smear-resistant, superior Advanced Ink. Featuring a metal barrel, with steel clip and accents. Retractable & refillable. Refillable with Pilot Acroball refills: Black 0.7mm Fine-P1A77347, Black 1.0mm Medium-P1A77297, Blue 1.0mm Medium-P1A77298.