Heavy duty matting with diamond tread pattern provides sure footing in a variety of applications. Beveled edges and colored safety borders promote safety while the industrial grade sponge reduces fatigue on egs and back. Sponge backing is resistant to many common oils, alkilydes and acids. Diamond-Dek Spong is comprised of 5/32″ Koroseal vinyl surface bonded to a heavy dut sponge. 9/16″ thick.