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 mmFilter 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 pinColour: as shownMaterial: ABSPackage Contents:1 Box * Hearing aid accessoriesOnly 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.