Tombow 55068 Ultra Rollerball Pen, Tortoise Shell, 1-Pack. Premier Rollerball Pen for the Ultimate Writing Experience Awarded numerous international design awards for high quality and design Combines exquisite finishes, contemporary design, generous barrel and comfort grip Waterproof, fast-drying pigment ink - won't smear, skip or fade Premium Tungsten cartridge - Black Ink, Medium point, 0.5mm Refillable with all Tombow ROLL Pen Refills. Please note: plastic must be removed from refill before using.