Heavy Duty Rubble Floor Mat, Black 3x5x3/4" Notrax 065-340 Challenger 3' x 5' Black Floor Mat T25 Challenger Safety / Anti-Fatigue / Wet Mat 3/4 Inch Thick Challenger is a lightweight anti-fatigue mat available in general purpose (black) and heavy duty (red) rubber compounds for varying degrees of grease and oil protection. Its large-hole design provides excellent drainage for removing liquids and debris from the worker platform and its lightweight construction makes it easy to handle. An aggressive anti-slip top surface enhances traction in wet or greasy environments.