Keep your Phonak hearing aids performing at their best with these replacement vented domes in Small size (7.5mm base diameter). Supplied as 2 packs, giving you a total of 20 domes, these soft, durable domes fit a wide range of RIC hearing aids including Phonak Audeo, Unitron, Discover Next, Audicus, Hansaton and Costco Kirkland Signature KS9/KS10/KS11. Vented design helps maintain natural sound quality and comfort. Easy to swap and replace monthly for hygiene. Ideal for maintaining clear hearing and extending the life of your devices.