Cerustop wax guards stop ear wax from penetrating into the hearing aids. Change them regularly to keep the hearing aids working well.
Cerustop wax guard for receiver-in-canal and custom hearing aids that use the Cerustop system. Phonak, Signia and Widex hearing aid brands this type of wax protections system.
GN Resound hearing aids also use the same size wax protection- the packaging looks different, but the Wax systems are the same.