Check the listing for details. Plantronics 29960-01 Voice Tube, Spare, Replacement. Condition: New. Listed at 9.50 USD. Plantronics® Plantronics 29960-01 Clear Voice Tube Replacement Part / Spare Part Plantronics' Replacement clear voice tube for the H81 Monaural Tristar®, H91 Encore® Monaural, H101 Encore® Binaural, H141 DuoSet® Monaural, H171 DuoPro® (Convertible) Monaural, HW251 SupraPlus® Monaural, HW261 SupraPlus® Binaural, H351 SupraPlus® SL Monaural, and H361 SupraPlus® SL Binaural model headsets. This microphone tube eXtension is required for crisp, clear communication when using a headset. Plantronics recommends for the microphone tube to be replaced every 4 to 6 months. Engineered, Designed in the USA and Made in Mexico to the high-quality Telco standards. Compatible Plantronics® models: H81 Monaural TristarH91 Encore Monaural / H101 Encore BinauralH141 DuoSet MonauralH171 DuoPro (Convertible) MonauralHW251 SupraPlus Monaurall HW261 SupraPlus BinauralH351 SupraPlus SL MonauralH361 SupraPlus SL Binaural Note: Not Compatible with H31 StarSet®, H41 Mirage®, H51 Supra® Monaural and H61 Supra® Binaural. SOLD AS IS. NO RETURNS ACCEPTED. We have described this item to the best of our ability. If you are unsure, please ask questions before making a purchase. We will gladly share whatever information we have with you.