Digipacks are made of plastic or cardboard unlike standard CDs which are made of plastic. Digipacks have four sides or pages while standard CDs have two sides. Most digipacks include a song lyric book tucked into the front cover. Digipacks are usually thinner than standard CDs since they are made of paper or cardboard. Digipacks typically display the album and artist name on the cover and include images of the artist for promotional purposes.