Jetpack began in the 1990s and is primarily musician Jetpack Dan or Daniel J. and Michael Kramer, who drums and co-produces. Although they are a duo with some guests on studio albums, they play live as a four piece. Jetpack often mixes the traditionally accepted surf instruments, such as Fender guitars and tube amplifiers, with nontraditional instruments such as fretless bass and 12 string Rickenbacker guitars, and branches into other related sub-genres of rock such as spy, noir, and rockabilly music.