A double extended play is a name typically given to vinyl records or compact discs released as a set of two discs, each of which would normally qualify as an EP. The name is thus analogous to double album. As vinyl records, the most common format for the double EP, they consist of a pair of 7-inch discs recorded at 45 or 33 rpm, or two 12-inch discs recorded at 45 rpm. The format is useful when an album's worth of material is being pressed by a small plant geared for the production of singles rather than albums and may have novelty value which can be turned to advantage for publicity purposes. Double EPs are rare, since the amount of material recordable on a double EP could usually be more economically and sensibly recorded on a single vinyl LP.