All-rubber, bi-level construction traps dirt and moisture.Our all-rubber floor mats meet the gsa commercial guidelines of the following anti-static performance tests: ibm (surface to ground), burroughs (surface to surface), aattc method 134 /static propensity test.Our all-rubber floor mats are constructed with 100% nitrile rubber, so mats can be used in areas exposed to most grease and petroleum products. All mats meet the guidelines of the ada. Nitrile rubber backing is slip-resistant for minimal movement on hard surfaces. 7 Colors available. Place up to 5 colors per mat on a black all-rubber base.