Quantity: includes 15 black ink refills, 15 blue ink refills, 30 pieces in all, a large amount of pen refills, you can share with your classmates and friends. Dimensions: the length of the pen refill approx. 3.9 inch/ 9.9 cm, 1.0 mm medium point for smooth writing Great additions to your writing supplies. Good quality: The refill body is made of metal material, which is lightweight and smooth Ink dries quickly with consistent ink flow, does not bleed. Ballpoint pen refills: This metal refill fits most ballpoint pens that use the same refill (note: please check your refill style to make sure this refill fits your ballpoint pen before ordering). Multi-function ballpoint pen refill: This refill fits most ballpoint pens as long as the size and pen match perfectly, suitable for office, business, school and home. The metal design is lightweight, space-saving and very convenient to carry. .