-. Brand : Phonak -. Feature : Phonak recommends these original replacement parts. / These HE Slim Tubes fit Ambria, Cassia and Solana open fit styles. / The size is P.R.Inted on the tiny end so use a magnifying glass and bright light so you can see it. / Please review the Product Description before ordering if you need assistance with ordering the proper size HE Slim Tube -. Label : Phonak -. Manufacturer : Phonak -. MPN : 054-0540 -. PackageQuantity : 2 -. PartNumber : 054-0540 -. ProductGroup : Health and Beauty -. ProductTypeName : PERSONAL_CARE_APPLIANCE -. Publisher : Phonak -. Studio : Phonak -. Title : (2-pack) Phonak Slim HE Tube: SCREW-IN type hearing aid replacement tubes