Reliable Compatibility: for Phonak cerustop wax guards filters are compatible with a wide range of devices from for Resound, for Widex, for Unitron, and for Phonak (not for Starkey ) making them suitable for most CIC, ITE, and ITC hearing aids and ensuring a hassle-free experience Function: for Phonak hearing aid supplies can prevent earwax, dust, oil, and moisture from clogging the hearing aid, prevent dust from entering the hearing aid, protect your hearing aid, and extend the service life of the hearing aid! Keep your hearing aids clean and your ears healthy Easy to Use: for Phonak hearing aid cleaning tools accessories are easy to operate, just use the removal end to remove the old filter, then use the end with the filter to install the new filter. Important Notice:If have perforated eardrum, please don't use the Wax Guards. Regularly changing these filters that you won't lose sound, providing consistent and reliable performance for your hearing aid Colour:White&Black Material:plastic Package Contents: 5 pack x Wax Guard Filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.