Hearing Aid Filters for Phonak Cerushield, Portable Disk Wax Guards Black Hearing Aid Filters Wax Guard Compatible with Phonak Marvel & Phonak Paradise Please note that our product is not sponsored or endorsed by, or affiliated with the brands it fits, including Phonak. Premium Material: The roulette storage box is made of quality ABS material, which is very strong and long-lasting, and the ear wax guard is firm and stable, which helps to extend the service life of the hearing aid, and you can use it for a long time. Excellent Design: The roulette storage design is convenient to use, you only need to put your finger on the concave-convex line and rotate gently in the direction of the arrow to reveal the hearing aid filter, it can effectively prevent earwax, and grease from clogging the horn of the hearing aid, to keep your hearing aids in top working condition. Essential Accessories: This hearing aid filter is small in size and light in weight, easy to carry, you can easily put it in your pocket or backpack, and suitable for daily shopping, or traveling, it is an ideal hearing aid accessory. Compatible Models: This ear wax guard is only compatible with Phonak Marvel, and Phonak Paradise hearing aids equipped with SDS 4.0 receivers. Not compatible with old model hearing aids and old receivers before 11/2018. Please confirm the model number before purchasing.