This is "Gakki Daizen 2012" (Musical Instrument Compendium 2012). It was released on April 5, 2012, by Shinko Music Entertainment Co., Ltd. It has a total of 298 pages. It contains real instrument data from the time of release related to guitars, amplifiers, and effectors. A DVD with 2 hours of content, including play-along videos and audio content linked to the articles, is included (unopened). I purchased it at the time of release but kept it at home unread, so it's in good condition. The included DVD is also unopened. However, there may be some slight aging. Please understand that this is a used item before purchasing.