Specifications: Name:10 Pieces Black Gel Ink Pen Refills Material: plastic, ink Tip size: 0.5 mm Ink color: Black ink refill Package contents: 10 x Ballpoint pen refills replacement Features: Practical gifts: This retractable pen refill set can not only be applied as your own spare refills but also can be served as gifts for your family members, classmates, colleagues, and friends. Widely applied: These ink refills for retractable pens are practical for home, office, school, factory, and so on, and can be applied for writing, drawing, sketching, etc.