This pack includes 5 spare filters for some of our face masks (check description) made by Barcode Berlin.D12 filters are built with 6 layers of material. They are easy to change and wash, so replace them regularly.How to wash D12 filters?Place the filters in boiling water for 3 minutes.How many times can I use D12 filters?D12 filters can be washed ten times before changing it.Check our selection of face masks in our shop and play safe with Barcode Berlin!