MRF Microphone Control Ring FillerLogin to place an order. Category: Hushbutton Description Reviews (0) Description Microphone Hole Filler. For when you want a Hushbutton but not a mic. MRA Rings sold separately. Reviews There are no reviews yet. Be the first to review “MRF Microphone Control Ring Filler” Cancel replyYour rating Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment. Related products MRA Microphone Control Ring0 out of 5Login to place an order. PCI 8 Channel I/O Module with IP Control0 out of 5Login to place an order.