The Saramonic SR-U9-WS3 is a 3-pack of Replacement Foam Windscreens. Always be prepared and never without back-up lavalier windscreens with this inexpensive 3-pack of replacement foam windscreens. Perfectly paired with the Saramonic WM4C-MC1 replacement lavalier clip and the SR-U9-MC1 2-pack of replacement lavalier clips for a fool-proof lavalier back-up kit. Designed for most Saramonic Lavaliers Designed for the Saramonic SR-M1 SR-UM10-M1 SR-UM9-M1 and WM4C-M1 lavaliers that are included with Blink 500 Blink 500 Pro UwMic9 SR-WM2100 VmicLink5 SR-WM4C UwMic10 and UwMic15 wireless systems. They are also designed for most other Saramonic lavaliers like the LavMicro Series SR-ULM10 Series LavMic Series and fit most For Lavaliers Between 5-7mm in Diameter The SR-U9-WS3 3-pack also works with most standard lavalier microphones between 5-7mm in diameter. Internal dimensions: 7mm x 12mm External dimensions 16mm x 35mm.