... clinical offices,housework,gardening and maintenance for filtering dust,pollen,and bacteria 4 ply Activated carbon face mask Description1)Material:4ply, ... BFE≥99%2)Color:white3)Size:17.5×9.5cm(for adult) 14.5×9.5cm(for ... and breathable5)In clinical offices,housework,gardening and maintenance for filtering dust,pollen,and bacteria.6)In laboratories ...