3M Clean Walk Replacement Pad 5842 is a white muliple layer sticky mat with individually tabbed layers.3M Clean-Walk Replacement Pad 5842 is the replacement pad for 5840. It is used in removing dirt and other contaminates from the bottom of shoes, wheels or any passing objects. Removal of particulate prevents contamination in sensitive operations such as clean room or paint area. Reduces maintenence and replacement costs due to premature wear of flooring surfaces.