Compete Audio Foam Microphone Windscreens (Microphone Covers) 50-Pack Headset/Lapel (Lavalier) Fitness Center Pack Black 50 foam windscreens for fitness instructor headset microphones Includes set lists for six holiday workout classes. Also good for telephone headsets, lavalier mics, computer gamer head set mics, recording studios, lapel mics Inside diameter 3/8 of an inch. Approx. 1.25 inches tall, 1 inch wide at widest.