The Sony XA-10B 10 Compact Changer Disc Magazine Cartridge is a pre-owned product designed for use with compatible Sony CD players. This disc magazine cartridge allows users to easily load and change compact discs, making it convenient for listening to their favorite music or watching movies. The included case provides storage and protection for the disc magazine, ensuring it stays clean and organized. Overall, this product is a practical addition to any home audio setup for those who enjoy listening to music on CD.