1Water and Oil Resistant: These wax guards are waterproof and oilproof, so you do not have to worry about water and oil corroding and staining guard filters.2Preserve Hearing Device: Effective protection and maintenance of hearing device to avoid frequent replacement or breaking or damaged, extending the life of hearing device.3Effective Cleaning: Most hearing device and listening devices can be cleaned in detail. And is convenient to install and use, even for the elderly.4Prevent Foreign Objects: Prevents earwax, dust, oil, and moisture from clogging the hearing device, which can avoid affecting function of hearing device.5ABS Material: Wax guards are hard, impact resistant, scratch resistant, and dimensionally stable, but also moisture and corrosion resistant to ensure long term durability.