New 2-pack of Phonak hearing aid micro tubes. Fits the following models of Phonak hearing aids: Phonak Certena, Phonak Certena Art Micro, Phonak Certena Art Micro Petite, Phonak Exelia Art Micro, Phonak Exelia Art Micro Petite, Phonak MicroEleva, Phonak MicroSavia, Phonak MicroSavia Art, Phonak Versata, Phonak Versata Art Micro, and Phonak Versata Art Micro Petite. Please look at images carefully. Size of tube can be determined by looking at the end of the tube where the dome is placed. Tubes have plastic loop to help tube from falling out. It can be removed if necessary.