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These are the classic HF3 wax filters used on some older Signia, Siemens, ReSound, and other brands’ in-ear hearing aids — typically for custom earmolds and some RIC ITC devices.
WaxGuard HF3 – Standard HF3 wax filters; protect the receiver from wax/debris.
HF3 Hearing Aid Earwax Ear Guard Filters – Another HF3 pack with red/blue coded filters (3 mm diameter), compatible with Signia and other brands.
📌 HF3 filters are color-coded red (right) and blue (left) and are around 3 mm in diameter.