1 Medium Clear Ear Gel Replacement for Plantronics Discovery 975 925 Modus HM3500 HM3700 HM1000 HM1100 HM1700 Marque 1 Medium Clear Ear Gel for Plantronics Discovery 975 925 Modus HM3500 HM3700 HM1000 HM1100 HM1700 Savor M1100 Marque M155 M100 MX100 Bluetooth Headset