Replacement rainbow voice tubes for Plantronics H31, H41, H51 and H61 model headsets.  This microphone tube extension is required for crisp, clear communication when using a headset.  It  is recommended by Plantronics, the manufacturer, that it 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.