2PCS Microphone Spacer for Sony XLR-A2M ,X LR - K1M,X LR - K2M, XLR-K3M ECM-CG50 ,ECM-CG50BP, ECM-CG60. The rubber tube washer / insert is used to make your microphone stable and reduce the noise, if the original adapter washer missed, it is difficult to get one.