Higher-grade media used for long-term archiving. Contains a 24 Karat Gold reflective layer for durability. The diamond coat surface is designed to protect media from scratches, repeated use and bad handling. Made with a patented dye formula which optimizes long life. Resistant to environmental degradation and UV light. Projected longevity of 300 years. Write once format. Compatible with leading CD writers and readers. NSN 7045-01-406-5391 is a mandatory purchase item for the Defense Supply Center ÌÎå¢åäÌ¢ÌâåäÌÝÌ Columbus.