| Description | Specifications | Questions & Answers | 
Uni-ball One ink doesn't just look good—it may even help you be a better student. A study at Ritsumeikan University in Japan found that students who studied notes written with a black Uni-ball One pen were better able to recall the information than students reading notes written in ordinary black ink.
Compared to the original Uni-ball One, the Uni-ball One F features a wider barrel and a lower center of gravity, making it more comfortable to use for long writing sessions.
Features:
| Model Number UNI 0423-01 | UNI 0423-01 | 
| Manufacturer Uni | Uni | 
| Body Color Black | Black | 
| Body Material Plastic | Plastic | 
| Capped or Retractable Retractable - Top Button | Retractable - Top Button | 
| Clip Material Metal | Metal | 
| Clippable Yes | Yes | 
| Diameter - Grip 10.8 cm | 10.8 cm | 
| Diameter - Max 11.1 mm | 11.1 mm | 
| Features Spring-Loaded Clip | Spring-Loaded Clip | 
| Grip Color Black | Black | 
| Grip Material Plastic | Plastic | 
| Ink Characteristics Fade-Resistant, Fraud Prevention, Quick-Drying | Fade-Resistant, Fraud Prevention, Quick-Drying | 
| Ink Composition Pigment-Based, Water-Based | Pigment-Based, Water-Based | 
| Ink Refillable Yes | Yes | 
| Length - Retracted 13.9 cm / 5.5 inches | 13.9 cm / 5.5 inches | 
| Pre-Installed Ink Color Black | Black | 
| Tip Material Metal | Metal | 
| Tip Size 0.38 mm | 0.38 mm | 
| Tip Type Conical | Conical | 
| Water-Resistant Water-Resistant | Water-Resistant | 
| Weight - Whole Pen (with Ink) 0.51 oz / 14 grams | 0.51 oz / 14 grams |