Shure R185B Cardioid Replacement Capsule with Windscreen for the WL185 Lavalier Microphone (Bright White)Cardioid cartridge for all Microflex MX183, MX202, MX391, MX392, MX393, MX412, MX418 microphones. R185B Black R185W White The Shure R185BQ is a replacement capsule for the WL185 cardioid miniature lavalier microphone. The cardioid pick up pattern provides adequate rejection of off axis ambient signal that can cause noise and feedback. The low profile sub miniature design is ideal for applications where the microphone must be concealed. The screw on