30 pieces three layers disposable mask pads replacement insert filte

strictly conforms to the national standards, our waterproof and dustproof mask liner pads will perfectly extend the life of your masks, thus reduce the waste of masks. universal design, suitable for various types of masks. easy to use: just peel off the adhesive paper, and then stick the pad to your mask interior, non-slip. efficient filtering provides you maximum protection from dust, saliva, pollen, haze fog pm2.5, animal hair, etc.