Areas of use: the direct filters fit many hearing aids from the WIDEX, , RESOUND, AUDIO SERVICE, UNITRON, HANSATON and much more. Diameter: these white hearing aid filters have a diameter of 1.3 mm Filter change - the filters can be easily and easily changed thanks to the practical replacement tool (black interchangeable pin). Compatibility: same size as the Widex , and Widex NanoCare filters (1.3 mm diameter) Better language understanding - we recommend replacing your filters regularly every 1-2 months. Usually a duller or quieter sound of the hearing aids indicates that a filter change is pending. Pack - a grey box always contains 8 individual filters. Each filter is mounted on a black interchangeable pin Colour: as shown Material: ABS Package Contents: 1 Box * Hearing aid accessories 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.