Sealed in packs of 10. $3.50 each for minimum quantity of 50 masks, $3.25 for 500 or more, $3.00 each for 1000 or more. For medical professionals only. Model A&F KN95. These were approved by the CDC as KN95 respirators on April 16, 2020 and have since been re-categorized as KN95 masks waiting for approval as respirators. The third party test shows >95% filtration.