Microphone Windscreen, Professional Thick Wind Shield Pop Filter, Acoustic Filter for 1.77 inch-2.36 inch Recording Studios Microphones, Sound-Absorbing Foam that Reduces Noise and Reflections. Used to install directly on the microphone. Support microphone: a large diaphragm with a diameter of about 4.5 cm to 6 cm. Recommended microphone orientation characteristics: cardioid, reduce external noise interfere with recording sound. Size: 20x18cm/7.87x7.09inch. 1st owner, never used, original package.