Contains high-viscosity, fluid-saturated ink preferred by writers seeking effortless performance. Fade-proof and water-resistant ink keeps your important documents protected. uni-ball™ ensures premium quality performance with every refill. Refill Format: Standard Ceramic Rollerball; Refill For Series: uni-ball™ Vision Elite® Roller Ball Pens; Refill Ink Color: Assorted; Color Family: Multicolor.