These disposable Hygiene Filters from Frida Baby are designed for use with the NoseFrida The Snotsucker nasal aspirator. After each use, discard the old filter and replace it with a new one to maintain optimal suction effectiveness. These filters are clinically proven to prevent the transfer of bacteria and mucus, ensuring a hygienic snot-sucking experience. Made from moisture-absorbing polyurethane, they effectively clear nasal passages with gentle suction, helping to loosen chest and sinus congestion. The filters are safe for both parents and baby, causing no injury. Each pack includes 20 filters. For seamless snot sucking, use these filters with Frida Baby's Nasal Aspirator NoseFrida The Snotsucker (not included).