Uni-Ball Refill Signo Gel Pen Black 0,7 mm Refill for Signo gel pens with 0.7mm size tip. These pens are perfect for journaling, card making, scrapbooking and all your projects or notes. Includes stainless steel tip, with 0.7mm diameter tungsten carbide ball. Plastic body and grip area. This gel ink rollerball pen is unique, its stroke is different and gives the feeling of writing with a fountain pen. Ideal for adding a personal touch to your writing. The finish is luxurious with a protected rubber grip. Colour: black. Brand: Uni-Ball