I'm not completely satisfied with the chair mat as it is too short for the depth of my desk. The wheels leave deep gooves in the mat that I have to "oomp" to get it out. It also does not stay flat on the edges so I'm constantly kicking it. I've always wanted one but now I regret getting it. Sorry!!
This Staples Model #: STP-17436 which was in stock at my local store and was supposed to work with an 1/8" flat pile rug but was too thin and chair would not roll. Returned and purchased model 20229-CC designed for a 3/8" flat pile rug which works just fine. I have three of these.