Sundstrom SR221 Pre Filter Packs.

This listing is for 8 packs containing 5 pre filters per pack for SR100/SR200 Masks.

I offer Royal Mail 2nd class sign for as standard or Royal Mail 1st class sign if you wish to choose this option.

I do offer discount on postage if you buy multiple items from me at the same time but I will have to refund you the extra postage once paid.