Plantronics Replacement Leather Ear Cushion, Pack of 6 (46186-01) Recommended for hearing impaired or noisy environments. Plantronics leatherette ear cushion for DuoSet, M170, M175, and CT14. Creates a better seal to the ear than foam ear cushions and blocks out maximum ambient room noise. Donut style allows maximum sound to the ear from the speaker. Inside diameter of ear cushion is 1.1 inches