Hearing Aid Ear Piece Cone Shape Domes 10-Pack Comfortable PSAP Kit Ear Tips Invisible

Hearing Aid Ear Piece Cone Shape Domes 10-Pack Comfortable PSAP (Personal Sound Amplifiers Product) Kit Ear Tips Invisible, Perfect for CIC Air 

This is a hearing aid Cone Shape domes set of chosgo open-air models with 10pcs of 6mm or 9mm or 12mm units.

These domes could be used with Chosgo open-air hearing aids, or Signia, Otofonix, LifeEar, Retone, Beltone, Newsound, Austar, Advanced Hearing, Hearing Assist or MD hearing aids.

If the ear dome is too big, your ear canal will feel pressure and will not be comfortable.
If the ear dome is too small, the sound will be leaked and you will hear a terrible squealing.
So it's important to choose your suitable size carefully in advance.
If you already know this size will be suitable for you, then please go on. 

They are

6mm Closed Dome
9mm Closed Dome
12mm Closed Dome