ReSound Cerustop wax guards are designed to protect the receiver component from debris and wax build up. Sold in packs of 8 wax guards. These wax guards are used in ReSound RIE products that have S and HP2 receiver wires. Please take care when ordering that you know which type of was filters you require. If in doubt please ask or alternatively seek advice from the company that supplied your hearing aids. If you order the wrong size / type of wax filter we are happy to replace with the correct item, if the product is returned unopened and in a re-saleable condition. We cannot however, accept opened packets.