HF4 Wax Guard HF 4 Black Signia Siemens Red/Blue HF4 Pro

Traditional HF4 / HF4 Pro Filters
These are the older style filter guards used on many Signia/Siemens RIC or custom hearing aids. Many have been replaced by the newer QuickGuard system, but these still fit devices that originally used HF4/HF4 Pro filters:

Signia Formelry Siemens HF4 PRO Wax Filter (Blue) – Blue filters (often for left ear) in HF4 Pro size.

HF 4 PRO hearing aid filters blue (16 pcs) – Blue HF4 Pro filters (Left Ear).

HF 4 PRO hearing aid filters red (16 pcs) – Red HF4 Pro filters (Right Ear).