Replacement voice tubes for Plantronics H81, H91, H101, H171, H251, H261, H351, and H361.  This microphone tube extension is required for crisp, clear communication when using a headset.  It  is recommended by Plantronics, the manufacturer, to be replaced every 6-months.   With the multi-colored value pack of voice tubes, many companies will use the same color of voice tube to distinguish different team members when competing for sales goals.