ABS Material: Cerumen baffle is made of high quality ABS material, safe and eco friendly, wear resistant and stable, sturdy and firm, durable for long term use. Hear Aid : Prevent earwax, dust, grease and moisture from entering or blocking the hearing aid, and protect the hearing aid movement, practical for use. Prevent Earwax Accumulation: Ear wax filter can prevent earwax from accumulating on the sound port of the receiver and improve the durability and reliability of the hearing aid. Compact And Portable: Light weight and in small size, easy to store and carry, can be easily put into your bag, perfect for travel, family gatherings, outdoor activities, etc. Applicable Brands: With nanometer coating , oil and water resistance. Suitable for Phonak hearing aid, easy to install, important and necessary accessory.