The Wearwell 095.18x45BL Clean Room Contamination Control Mat traps impurities in areas that require dust and dirt control. The tacky surface pulls dirt and dust off shoe soles before they can contaminate a clean room. Effective and easy to use, each mat has 30 layers of tough film laminated together in a stack. Once the top film is contaminated, simply pull it off and discard. The Wearwell 095.18x45BL Clean Room Mat offers economical dirt control for low-profile carpet, tile or concrete surfaces.