The BETA 181 Cardioid Compact Side-Address Instrument Microphone from Shure is a durable, small diaphragm, electret condenser microphone with an interchangeable capsule design. The Beta 181 ships with a cardioid capsule for drum overhead, piano, and acoustic instrument applications, as well as an M/S stereo technique (paired with BETA 181/BI). The microphone features a wide frequency response and rugged build, making it great for the stage and recording studio.