EK Success Writer Dual Metallic Markers, 6 Per Pack Pigment ink. acid free. archival quality. Lightfast. fade proof. waterproof. non-bleeding. Store pens horizontally for best results. Double tip: 1.0-Mm and 1.2-Mm tip. Dual tipped writers are perfect for scrapbooking Pigment ink is acid-free, archival quality, lightfast, waterproof, fade proof, and non-bleeding This six-pack includes-Silver, Gold, Violet, Blue, Red, and Green. Tip sizes-ultra fine-1.0-millimeter-fine-1.2-millimeter Conform to ASTM D4236 Pigment ink. Acid-free. archival quality.