1. Waterproof and oil- filter, can prolong the life of your hearing device by preventing earwax or water from being inside. 2. Made of quality material, which ensures durability of long time use. 3. Mini size, can fit most hearing aids for RESOUND, for , for UNITRON, for WIDEX, for ACOSOUND, etc. (Do not fit for , for ). How to use: 1. Use screenchanger to take out old filter. 2. Clean the edge of the horn on the hearing aid. 3. Use the other end to stick a filter. 4. Install a filter and make sure it firm. Note: 1. Please confirm the filter installed firmly, preventing it from being in auditory meatus. 2. Replace the earwax filter according to the circumstances after using every month. 3. Use brush to clean the earwax filter frequently. Color:Black Material:ABS Package Contents: 40 * Earwax Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.