The 30 pack of Memorex Music CD-Rs is a high-capacity blank recordable CD set ideal for music recordings or other long-run storage needs. Each CD has a capacity of 700 MB and can be written at a maximum speed of 40x. These CD-Rs are perfect for musicians or individuals looking to create their own mixtapes or store large amounts of music files. With a durable construction and reliable performance, these CDs are a great choice for all your recording and storage needs.