Clenare nasal filter is a small device that sits discreetly into the nostrils and passes clean filtered air directly to them. it's so soft that it's presence is hardly felt when worn and it's transparent body makes it difficult to spot with the naked eye. this starter pack contains:discreet nasal filter bodyfree replacement filter pre-loaded into the body for use. pocket friendly carrying casecomplimentary tweezers for disassembly and cleaning.precise instruction manual sheet.easy to use assembly disassembly drawings.clenare nasal filter blocks particles down to size pm0.3 & pm0.1 and also have the benefit of blocking many microbes including bacteria & viruses which can be of variable sizes. the clenare nasal filters come with a special electrostatic nano fiber material which can be replaced every few days. once saturated the replaceable filter media turns black and then it should be replaced with a fresh pair.