(Small-Medium) Dust Mask Washable and Reusable + 4 Active Carbon Filters ( FFP1+ FFP2) Included, Multi-Purpose Particulate Respirator Gray/Green Avalible at Amazon Prime , ASIN: B01MQYG5AM Make a good seal with face and minimize the leakage in the mask Washable and reusable with replaceable filters save money Can adjust the mask size by pulling soft part longitudinally ( size increase 10-15%) Light weight 2.0 Oz ( 58 grams ) + 4 filters included in all models