Plantronics Set of 4 Spare Ear Hooks for CS50 CS50-USB CS55 CS55H CS55 Micro CS60 CS60-USB CS60 Micro C65 M3000 M3500 Avaya AWH55 AWH-65 AWH55+ AWH65+ AWH65 USB - Free AvimaBasics Cushion Included Material: Nylon Compatibility: For Plantronics CS50, CS50-USB, CS55, CS55H, CS55 Micro, CS60, CS60-USB, CS60 Micro, C65, M3000, M3500 and Avaya AWH55, AWH-65, AWH55+, AWH65+, AWH65 USB It comes packaged with 4 different sizes (Small, Medium, Large and the new Comfort loop). (One Free AvimaBasics Cushion Included (this part is not Plantronics brand). Plantronics P/N 64394-11 also known as P/N 64394-01 Plantronics Spare Nylon Ear Hooks / Loops Kit (4 pieces / per kit)