a) Size: 4"
b) Provision: Having two elastic straps to fasten above &
below the
ear to prevent the dust
c) Material: The cloth used for fabricating dust mask should
be able
to prevent entry of dust
a) Size: 4"
b) Provision: Having two elastic straps to fasten above &
below the
ear to prevent the dust
c) Material: The cloth used for fabricating dust mask should
be able
to prevent entry of dust