Mask4Aide melt-blown disposable mask filters add 3 layers of filtering protection. Adheres & fits into most masks. It comes with 10 filters to a pack. Each filter has 2 adhesive stickers on the back to stick filter securely inside your Maskeraide mask. Wear comfortably for hours at a time. One size fits. Reusable | washable. Breathable. Not handmade. These masks are not FDA Approved. *Please note these are not a replacement for medical-grade N95 masks or PPE but are meant to bridge the gap.