Size Extra Large fits 40″ to 58″. These are the old size. These are bigger than the new size. Abdl Friendly.
Advanced Leak-Proof Design: Constructed with a stainless steel casing, composite sealing diaphragm, and a sealed plastic tab to lock in power and block out air.
• Fits select ReSound, Widex and Unitron hearing-aid models. • Designed for hearing aids that use compatible Phonak/CeruStop-style wax guards. IMPORTANT: Wax guards are not universal. Compare the shape and size of your current filter and confirm compatibility with your exact hearing-aid model before purchasing.