I bought this 1/2 face mask to wear while sanding wood projects. In order to remove small dust particles, a filter is required. No big surprise there. What was a surprise is that the particle filters ordered along with the mask, require two plastic holders that did NOT come with the mask. Seriously? Its like buying tissues, getting home, opening the package only to find a bag of tissues with no cardboard box to hold them. Of course, they will sell you these cheap plastic filter holders that should come with the mask as an included part of a cheaply made mask. Who thinks this stuff up? I expected more from 3M, but I’ve been wrong before. I can’t help but wonder what other of their products they cheap out on in areas that aren’t as easily noticeable? Its really surprising to me that 3M would put their name on a product where this underhanded smoke and mirrors sales tactic could not go unnoticed. It’s really very short sighted. Personally, I would terminate (fire, not kill) someone with so little integrity as to propose such a tactic. Hopefully the eight cents per unit saved in manufacturing costs comes around to bite 3M in the rear echelon. I wouldn’t recommend this to my worst enemy.