You are bidding on 4 dynamic microphones for vocals, toms, and brass instruments. In detail: Manufacturer: Shure Model: Beta 57A Color: grey-blue Weight: 275 g Dimensions: 160 mm long; 43 mm diameter Frequency range: 50 - 16000 Hz Output impedance: 150 Ohm For further technical equipment, see the manufacturer's website. The microphones are in a like-new and original packaging condition. The original packaging shows signs of use in the form of vo