Triune: The three flanges help to keep the tube in perpendicular relationship to the eardrum

-3.0% perforation rate! -Easy insertion with standard forceps! -Soft angled flanges contour to the TM! -Three flanges hold the tube perpendicular to the TM! See: http://www.gracemedical.com/sites/488/uploaded/files/LIT0056_CID6021_Triune_Tube_Sales_Sheet.pdf