16 mm film is a historically popular and economical gauge of film. 16 mm refers to the width of the film, with other common film gauges including 8 and 35 mm. It is generally used for non-theatrical (e.g., industrial, educational) film making or for low budget motion pictures. It also existed as a popular amateur or home movie making format for several decades, alongside 8 mm film, and later Super 8 film. In 1923, Eastman Kodak released the first 16 mm "outfit" consisting of a camera, projector, tripod, screen and splicer for $335. RCA-Victor introduced a 16 mm sound movie projector in 1932 and developed an optical sound-on-film 16 mm camera, released in 1935.