Phonak vented domes medium size (diameter at base of phonak domes 0.35 inches=9mm).
Phonak hearing aid domes comes with 2 packs per order, which equals out to a total of 20 domes.
These phonak hearing aid accessories fit with Phonak Audeo, Unitron, Discover Next (DX), RIC, Audicus, Hansaton, Costco Kirkland Signature KS9, KS10 and KS11.
Suggest: Phonak hearing aid accessories should be replaced once a month, because the cerumen wax buildup behind the domes.
Notice：If a perforated eardrum, please don't use the phonak domes.