Features: Our black and blue pen refill is designed for easy installation and replacement. With a smooth and simple process, you can quickly replace your old refill with our new one, saving time and effort. These replaceable pens refills are considerate and pragmatic presents to your family members, friends, conveying your love, care and kindness to them, getting relationships and emotions closer with each other. Specifications: Material: metal, plastic Color: as picture shown Size: about 2.75 inch/ 7 cm, 3.15 inch/ 8 cm, 3.93 inch/ 10 cm, 4.53 inch/ 11.5 cm in length Package includes: 12 x Black ink refill 12 x Blue ink refill Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. Pointed items are included, please keep it away from kids.