The Pilot Acroball 4+1 is a multi-function pen that combines four 0.7mm ballpoint pen inks with a 0.5mm mechanical pencil. The pen features a comfortable, tire-thread rubber grip and low-viscosity Acro ink for an extra-smooth writing experience. The BH41AB is made with a body constructed from recycled plastic.

• 5-in-1 functionality: One pen includes four colors of 0.7mm ballpoint ink (black & light gray) and a 0.5mm mechanical pencil.
• Smooth writing Acro ink: The oil-based Acro ink is low-viscosity, allowing for smooth, skip-free, and dark writing. It is also water-resistant.
• Comfortable grip: The soft rubber grip has a tire-tread-like pattern that prevents slipping and reduces hand fatigue during extended writing sessions.
• Durable design: A "soft clip" mechanism uses a spring coil, which Pilot states can be clipped 100,000 times without breaking.
• Eco-friendly: The pen body is made from recycled plastic.
• Refillable: The pen uses replaceable Acroball refills.