Color: Pen Refill. Provides a smooth and consistent writing experience, perfect for everyday office work and studying. Size: Pen Refill length 4.5 inches, medium tip 1.0 mm; Note: Please check the size before purchasing. Quantity:There are a total of 40 pen refills, providing ample supply ; you can share them with classmates or friends. Quick-Drying Ink: The quick-drying ink ensures your writing 't smudge, eliminating the need to wait for the page to dry. Wide Compatibility: Metal ballpoint pen refills are suitable for office, business, school, and home use; compact and portable, easy to carry, and compatible with a variety of standard pen barrels. 11.6cm/4.57inch Pen Ink Refills, Replaceable Pens Refills, 1mm Medium Tip, The Metal Ballpoint Pen Replacement Kit, Blue Black Ink, Supplies Writing Color: Blue Material: Metal Package Contents: 40 * Pen Ink Refills Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.