Primacoustic CG421 CrashGuard for Sennheiser MD421The Crashguard 421 Drum Microphone Shield from Primacoustic shields your Sennheiser MD421 drum microphone against noise from nearby cymbals for a cleaner sound. The shield is constructed using high density foam for maximum absorption and is designed with a cable access port so it won't interfere with the microphone cable. High density acoustic foam liner High impact ABS outer shell Innovative rear access cable port Reduces sound of cymbals from