NEW. 5-packs of 8 filters. Phonak Cerustop Wax guard for Phonak receiver-in-canal and custom hearing aids using the Cerustop or WaxTrap systems. Please note that this is the new WaxTrap2 system. They are fully interchangeable with the older WaxTrap filters. The removal stick is now threaded which makes removal easier. To remove the old wax guard, insert the threaded end in the opening of the wax guard, twist and pull out the old guard. To insert the new filter, flip the tool and insert the new wax guard.