Heavyweight 100% vat-dyed sulphite with longer, stronger fibers. Tough enough to take scoring, folding and curling without cracking or tearing. Superior fade-resistance keeps projects brighter longer. Acid-free for archival quality. If you have any further questions, please feel free to contact us. We look forward to serving you in the future. Brand: Pacon Color: Black Manufacturer Part Number: 103093 Model: 103093 Manufacturer: Pacon