Heil Sound Windscreen for PR20 & PR35 Microphones Windscreen for PR20 & PR35 Microphones The WSM windscreen helps eliminate "B" & "P" pops in your vocals The WSM is designed to snuggly fit the Heil PR20 and PR35 dynamic microphones The WSM windscreen helps eliminate "B" & "P" pops in your vocals The WSM is designed to snuggly fit the Heil PR20 and PR35 dynamic microphones