Verbatim 4.7 Gb Dvd Rw (4x) discs - 30-pack silver. Each rewritable disc holds 4.7 Gb or about 120 minutes of Dvd-quality video and supports 1x-4x recording speeds. The Super Eutectic Recording Layer (Serl) dye minimizes noise during write/rewrite cycles and improves archival stability. Discs are compatible with most Dvd-rom drives and writers from major Dvd R/Rw manufacturers, ideal for backups and archiving.