Waxguards 3.0 NanoCare 10993607 Filters (white) are premium protective filters, made of high-quality materials to prevent wax, dust and debris buildup, extending device lifespan. Compatibility:The WaxGuard 3.0 Nanocare is compatible with Signia and Rexton hearing aids: Signia models include Pure AX (312, CHG, CHG T) and Styletto AX; Rexton models cover BiCore RIC (R 312, R-Li, R-Li T) and BiCore SR.