These domes are for use with the Oticon range of micro BTE hearing aids, which are currently: Vigo Pro / Safran / Go Pro / Vigo / Tego Pro / Syncro / Tego / Spirit 3 / Spirit Zest / Spirit Zest. These items are supplied as Oticon ‘like for like’ replacements. Please refer all questions as to suitability to your hearing aid audiologist or email us.