Amazon.com : Lanier Combo Pack - 8 Genuine Schmidt 635M ISO 12757-2D, D1 Ballpoint Pen Refills, Compatible With Swarovksi Crystalline Pens also included are 8 Plastic Tops Included - 4 Black and 4 Blue (Assorted) : Office Products
Four 5 Pack - Schmidt 635 - Red Ink, Medium Tip - Walmart.com