Zebra Biotube Jim Knock Ballpoint Pen Refill - 0.7mm - Black Ink

Sustainable Refills for Smooth Everyday Writing

The Zebra Biotube Black Ink Refills offer a smoother and more sustainable way to continue using your Biotube Jim Knock ballpoint pens. Each refill contains water-resistant 0.7 mm emulsion ink, combining the reliable performance of oil-based ink with a lighter, smoother writing feel. Made with sugarcane-derived biomass plastic, these refills help reduce environmental impact without compromising everyday writing quality.

Product Highlights

• Smooth 0.7 mm emulsion ink delivers clear and consistent lines

• Water-resistant black ink is practical for notes, school, and office work

• Sugarcane-derived biomass plastic reduces CO₂ emissions by 73% compared with conventional refills

• Eco Mark-certified design supports more environmentally conscious writing

Product Details

• Type: Ballpoint Pen Refills

• Tip Size: 0.7 mm

• Ink Type: Water-Resistant Emulsion Ink

• Ink Color: Black

• Compatibility: Zebra Biotube Jim Knock Ballpoint Pens

• Material: Sugarcane-Derived Biomass Plastic

• Certification: Eco Mark Certified

• Brand: Zebra

• Made in Japan

A Little Note

Designed to extend the life of your favourite pen, these Biotube refills make everyday writing feel both effortless and thoughtful. Their smooth black ink and environmentally conscious construction offer a dependable choice for students, professionals, and daily stationery lovers.