Uniball pens (often branded as Uniball) are known for their smooth ink, innovative technology, and strong refill ecosystem, making them one of the most reliable choices for a refillable pen in the U.S. market. The brand offers a wide range of gel, rollerball, and hybrid ink pens designed for consistent performance, quick-drying output, and reduced smudging. While many Uni-ball pens use proprietary refills engineered for optimal ink flow and longevity, they are widely available and easy to replace. People choose Uniball for its dependable writing performance, ink innovation, and strong everyday usability across school, office, and professional environments.
Uniball pens official website: https://www.uniballco.com
Uniball Pens Refills
Uniball Zento Liquid Gel
The Uniball Zento Liquid Gel Refill is designed specifically for the uniball Zento retractable pen, delivering the same ultra-smooth, quick-drying liquid gel writing experience as the original pen. Featuring a medium 0.7 mm point and rich liquid gel ink, it provides precise, effortless writing with smooth, consistent flow for everyday use, journaling, and professional writing. Length: 111 mm (4.35 in)
Uniball 207+ PLUS / 307
The Uniball 207+ PLUS / 307 Refill uses advanced uni Super Ink Plus+ technology to create water-resistant, fade-resistant, and fraud-resistant documents with smooth, vibrant gel ink performance. Designed for uniball 207+ PLUS and 307 retractable gel pens, this refill produces rich, clean lines even on glossy paper while maintaining the dependable archival-quality performance the 207 series is known for. Not compatible with 207 IMPACT models. Length: 111 mm (4.35 in)
Uniball 207 Gel
The Uniball 207 Gel Refill features pigment-based uni Super Ink technology that bonds into paper fibers to help resist water, fading, and document fraud. Known for smooth ink flow and long-lasting writing performance, this refill fits many uniball retractable gel pens and some pens designed for standard ceramic rollerball (RB) refills, including the popular Pilot G2 Gel Refill, and the Pentel Energel Refill. Available in multiple point sizes and ink colors for dependable everyday writing and archival-quality documents. Not compatible with 207 IMPACT models. Length: 111 mm (4.35 in)
Uniball Jetstream RT
The Uniball Jetstream RT Refill is a Japan-style ballpoint stick refill designed for select Uni-ball retractable pens. Using hybrid Jetstream ink technology, it combines the smoothness and dark line quality of a gel pen with the quick-drying performance and reliability of a ballpoint. Its low-viscosity ink produces exceptionally smooth writing with excellent smear resistance, making it especially popular for fast writing and left-handed users. Length: 118 mm (4.65 in)
Uniball POWER TANK RT
The Uniball POWER TANK RT Refill is a pressurized ballpoint refill engineered to write reliably in extreme conditions, including upside down, on damp paper, and in cold temperatures. Using uni Super Ink technology, it delivers water-resistant, fade-resistant, and fraud-resistant writing with smooth, dependable ink flow under demanding conditions. Designed for POWER TANK retractable pens, this refill combines rugged pressurized performance with everyday writing comfort. Length: 111 mm (4.35 in)
Best-Selling Uniball Pens
Uniball Jetstream
The Uni-ball Jetstream is one of the brand’s most popular pens, known for its hybrid ink technology that blends the smoothness of gel with the quick-drying properties of a ballpoint. It is widely favored for everyday writing, note-taking, and professional use due to its clean, smear-resistant performance. The Jetstream line is refillable, making it a long-term, cost-effective writing solution for both students and professionals.
Uniball Signo 207
The Uni-ball Signo 207 is a popular gel pen known for its vibrant ink and anti-fraud technology that helps prevent document alteration. It delivers smooth, consistent lines and is commonly used in both office and academic settings. Its refillable design and wide availability make it a dependable everyday writing instrument.
Uniball Vision Elite
The Uni-ball Vision Elite is a premium rollerball pen featuring a capless design that prevents ink from drying out, even during air travel. It provides a smooth, liquid ink writing experience with bold, expressive lines. It is a strong choice for professionals who want reliability and performance in a rollerball format.
Uniball One
The Uni-ball One is a modern gel pen designed for bold, highly saturated ink that stands out on the page. It uses advanced pigment technology for darker, more vivid writing compared to traditional gel pens. Its smooth ink flow and contemporary design make it a favorite for students and professionals alike.
Uniball 307
The Uni-ball 307 is a high-performance gel pen designed for smooth writing with minimal smudging. It combines a comfortable grip with consistent ink flow, making it ideal for extended writing sessions in office or academic environments. It offers a balance of reliability and everyday usability.
Uniball Zento Gel Pen
The Uni-ball Zento Gel Pen combines exceptionally smooth writing performance with a calming, minimalist design inspired by mindfulness and intentional living. Its thoughtfully designed barrel features a seamless soft grip made with 75% recycled material, giving the pen a refined and comfortable feel during extended writing sessions. The quick drying liquid gel ink and precise 0.38 mm tip produce clean, consistent lines that are ideal for journaling, note taking, planners, and detailed writing tasks. It uses the proprietary Uniball Zento liquid gel refill system engineered for smooth ink flow and fast drying performance. Buyers are drawn to the Zento for its modern aesthetic, premium writing experience, and carefully balanced combination of comfort, precision, and sustainability.
Uniball Pens Refill Compatibility & Ecosystem
Strength: Very strong
Compatibility: Mostly proprietary formats with some cross-compatibility (e.g., D1 systems)
Key Advantage: Broad refill availability and strong ink innovation
Consideration: Many refills are optimized for specific Uni-ball systems
Uniball Pens Are Best For
- Everyday writing
- Students and professionals
- Smooth gel and hybrid ink performance
- Users who want reliable, widely available refills
Uniball Pens Quick Specs
Founded: 1887
Country: Japan
Known For: Ink innovation and hybrid writing systems
Refill Types: Proprietary gel, rollerball, hybrid ink, D1 mini systems