Filters to put in the inside pocket of reusable cloth masks.
Once you have washed the Miregucas masks 25 times, it is recommended to use a filter between the two layers of fabric.
Here you have a good option. Each filter has five PM2.5 layers and each package contains 6 filters.
These filters have the size for the adult mask L and XL: 12.5cm x 8cm approx.