You are buying 1 medical red tip general electric 3 mica black plate 6072 / 12a7 tube. There is 15 available buy 1 or as many as you want up to 15 tubes.THESE TUBES ARE DEAD QUIET AND GOOD FOR MICROPHONES GUITAR AMPS AND OTHER STUFF IN RECORDING STUDIOS.THE TUBES ARE MARKED 6072 IN WHITE AND ARE BALANCED AND TEST NEW ON ARE AMPLITREX AT1000 TUBE TESTER.