- Phonak recommends these, their original replacement parts from Hearing Aid Battery
- Tubes fit Ambria, Cassia and Solana open fit styles.
- Audiologists recommend changing these hearing aid tubes every 6 months.
- The size is printed on the tiny end so use a loupe and bright light so you can see it.
- Blue lettering is for the Left Side Hearing Aids - these are Size 1-L