These are for Oticon hearing aids: Ria, Ria2, Nera, Nera2, Alta, Alta2, Opn1, Opn2, Opn3, Siya1 and Siya2, Ruby1, Ruby2, OpnS1, OpnS2, OpnS3, More1, More2 and More3. There are 10 domes per pack.