Zebra Z-Grip MAX Gel Retractable Ballpoint Rollerball Pen, Medium Point, 0.7mm, Black, 12-Count 0.7mm medium point, black easy-glide ink for top of the line writing performance The Z-GripMAX gel retractable gel pen features acid free, archival quality blue ink This check safe permanent ink penetrates paper and can't be removed Sleek pen barrels compliment the lustrous performance of the ultra-smooth gel ink Your maximum comfort is guaranteed, thanks to this retractable gel pens uniquely designed barrel and comfort grip providing a superior writing experience