6-Pack Clear Voice Tube Replacement For Encore,Tristar and SupraPlus,intended for Plantronics Headsets Replacement Accessory Spare Parts - VOICETUBES CLEAR VOICETUBES CLEAR ENCORE/TRISTR/SUPRAPLUS Compatible With Plantronics Encore,Tristar,SupraPlus,Duoset and Duopro Headsets for H81,H91's & H101,H251's,HW251,HW261's,H171,H141 Easy-to-install design quickly replaces worn-out or dirty head tubes for convenient use For best performance, routinely replace the voice tube every six months Packaged quantity: 6 pack