New Widex Cerustop filters. Same filters as Widex Cerustop. Traps moisture and wax. There are eight filters per pack and five packs per order. A total of forty filters. Please verify type of filters needed for your hearing aids among ordering. 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. Due to hygiene reasons meant for your health and safety, this product is not refundable or exchangeable after opening. At The Hearing Aid Battery Club, you know you are buying safe, original manufacturer accessories, batteries, and replacement parts. Thank you.