Pilot Acroball. Type: Clip-on retractable ballpoint pen. Writing colours: Black. Colour of product: Black. Pilot 020101001 Retractable Ballpoint Pen - Black (Pack of 10) Acroball retractable pen 78% recycled Pack of 10. For 90 years, PILOT has been... Pilot BeGreen Acroball Retractable Ballpoint Pen Recycled 1mm Tip 0.32mm Line Black (Pack 10) PILOT ACROBALL, the smoothest writing ballpoint pen from Pilot. Write with fluidity and ease due to the smooth-flowing, low viscosity oil-based ink which also delivers fast-drying and long-lasting writing performance.