Plantronics MX100, MX150, MX153 Series Original 5-Pack Replacement Ear Cushions - Black Ear Pad Cover made of soft sponge Fit Earphone Diameter : 0.5"-0.7"/13-18mm Cover size: 18 x 8mm / 0.7" x 0.3" (D*H) Package : 5 pieces x Ear Pad Cover