3M8710E Dust Respirator (20 Masks/Box). (Priced Per 1 Box of 20 Masks). Reliable, effective protection against fine particulates - Durable collapse resistant inner shell - Excellent fit over a wide range of face sizes provided by convex shape, nose clip and twin-strap design - Comfortable, lightweight off-the-face design Standard: EN149:2001 FFP1 Approval: CE Marked Maximum use level: Assigned Protection Factor: 4 x OEL (Nominal Protection Factor 4 x OEL).