Matilda's Own. Using the knowledge gained by making mask filters for the CSIRO in recent trials, this highly efficient face mask filter has been created. 100% Made in Australia from Hollow Conjugated Polyester for moisture absorption and extremely effective particle filtration. Each pack contains 4 x A4 sheets, measuring 210mm x 297mm for use with your own cotton outer. Makes up to 24 refills. Refills are washable but it is recommend replacing them after each use.

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