Phonak CeruShield Disc is the new wax system from Phonak designed as an easy to use dispenser wheel. The CeruShield Disc consists of 8 new CeruShield filters and 8 positions for easy disposal of used wax filters. CeruShield filters protects the receiver from wax related problems and offers longer wearing time between filter changes. CeruShield filters have been designed specifically to be used with Phonak's SDS 4.0 receivers.