3M 9161E FFP1 Ventilated Dust Mask (15 Pieces). Features: The 3M™ VFlex™ Particulate Dust Mask 9161E provides economical FFP1 protection. It has a unique 3M filter material and a valve to make breathing easier. The mask folds flat for easy storage and has a flexible, V-shaped design. It features a built-in adjustable metal nose clip for a secure seal and side tabs for easier positioning on the face.