24/Seven Solid For mostly dry environments and areas overspray or other slip hazards. Named for it's ability to work twenty-four hours a day, seven days a week to keep your employees comfortable and productive, the 24/Seven® mats are substantial, modular, molded rubber anti-fatigue mats. They are 5/8" thick single work station mats, but have a hidden interlocking system designed to connect on all four sides to quickly cover large areas. For extra employee safety, attach the 3" wide black or yellow safety beveled edge. 24/Seven mats are available in two compounds: All Purpose - natural rubber for use in dry areas and around water. New CFR - a totally new and innovative compound that is resistant to mineral oil based cutting fluids and provides good chemical resistance.