The product is a lot of 10 factory sealed HP DDS-4 20/40GB data cartridges. These cassette-style data cartridges are designed for use with HP DDS-4 drives and offer a storage capacity of 20GB native or 40GB compressed per unit. Manufactured in Japan by HP, these cartridges are ideal for data storage and backup applications in computers, tablets, and networking systems. Each unit is sealed and guaranteed to provide reliable storage solutions for your data needs.