The DPA Microphones Miniature Magnet DMM00011-B (Black) is a microphone holder that uses a strong magnet for mounting. And as the magnet is attached to the mounting piece, it is possible to use this unit on other a number of metal surfaces. It is well suited for everything metal, including grand and up-right pianos (on their frames), or drums with metal rims. This unit can hold up to two miniature microphones by their cables, or one by the housing.