The Pilot Acro 300 0.3mm is an ultra-fine pen known for its exceptionally smooth, low-viscosity Acro ink. It is popular choice for fine writing and detailed notetaking. While the barrel is made of plastic, the pen features a metal grip section that adds a low center of gravity for stable writing. All 0.3mm versions of the pen come with black ink, though refills available in various ink colors and tip sizes.

• Ink: The pen uses "Acro ink," which is an oil-based hybrid ink formulated to be 80% less viscous than standard ballpoint ink, creating a very smooth and skip-free writing experience.
• Tip size: The 0.3mm micro-fine tip provides a precise, clear, and delicate line that is ideal for small writing.
• Design: The Acro 300 is a retractable, knock-type pen with a slim, smooth resin barrel and a comfortable metal grip section.
• Barrel colors: The 0.3mm pens are available in a variety of soft, pale barrel colors, known as the "Misty Series," including Misty Coral Pink, Misty Green, Misty Purple, and Misty White.
• Refills: The pen is compatible with Pilot's BRFV series refills, which come in a range of tip sizes and colors.