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First-time buyers are highly recommended to purchase the 4 size(S/M/L/XL) pack to choose the right size.Why you choose Cozibreath Nasal Filter FLEXIBLE SHAPE - Designed according to the natural shape of your nose for seal, comfort and fit with soft, comfortable, medical-grade plastic, BPA and Phthalate-free. ALMOST INVISIBLE - The only part outside your nose is the short and thin connector which offers great discreetion. COST EFFECTIVE - The frame is reusable and easy to rinse. The filters replacement should be replaced every 2-3 days. Also, the filters replacement can be purchased separately. DRUG FREE - This is an alternative to tablets, nasal sprays and other anti-allergy medications. 2.what's the difference between the 3 models? Model A:Outer Frame + Nanometer Filters,Block most airborne particles with excellent breathabilityModel B:Outer Frame + electrostatic filters + Inner Retainer,Block most airborne particles with better breathabilityModel C:Frame + Nanometer Filters + Foam sponge,Block most airborne particles with good breathability