3M 9101E FFP1 Valve Dust Mask (25 Pieces) Features: 3M™ VFlex™ Particle Dust Mask 9101E provides economical FFP1 protection. It features a special 3M filter material that makes breathing easier. It has a bendable, V-shaped corrugated design. Our lightweight, disposable dust mask folds flat for easy storage. It includes an embedded, adjustable metal nose clip for a secure seal, and side tabs for easier positioning on your face.