These tubes are for use with the Phonak range of micro BTE hearing aids, which are currently: Exelia Art micro / Versata micro / Certena micro / microSaviaArt / microSavia / microEleva / microeXtra / Exelia ART micro petite / Versata micro petite / Certena micro petite These consumable items are supplied as Phonak ‘like for like’ replacements. Please refer all questions as to suitability to your hearing aid advisor/clinic.