The AKG CK91 is a cardioid capsule from the AKG Blue Line Series. It mounts directly on the SE300B powering unit and is part of a collection of capsules that includes omni-directional, hypercardioid, and shotgun capsules. The CK91 has a very consistent polar pattern and excellent off-axis frequency rejection. The CK91 is an ideal tool where attenuation of off-axis sounds is needed. Includes foam windscreen. The AKG Blue Line series is known for its smooth frequency response and warmth. Includes a foam windscreen.