PENTEL-Arts Sunburst Metallic Gel Pen Set: Silver and Gold. These medium line gel ink pens are the perfect way to add a little sparkle to your paper crafts; scrapbooking projects and greeting cards. They write smooth medium lines with acid-free; permanent; waterproof and fadeproof ink. Tip size: 1.8mm. Conforms to ASTM D4536. Made in USA.