From an authorised RDE seller
The RDE WS7 Deluxe Windshield is an easy to use high-performance windshield for shotgun microphones. Designed to reduce wind noise when recording in adverse environmental conditions, the WS7 combines an open-cell foam surround with an outer layer of acoustically transparent artificial fur. A rubber base prevents any wind noise from entering the rear of the microphone pickup area. Suitable for the RDE NTG3 and any shotgun microphone with a maximum slot length of 186.5mm (7 1/4") and a diameter of 19-20mm.