XCR4 Cork/Rubber flooring by Expanko Resilient Floors provides the resilience and acoustic contributions, durability and low maintenance ideal for museums, educational facilities and stadiums. When installed with heat welding rods, XCR4 not only creates a seamless floor, but is a natural occurring inhibitor of bacteria, fungus and mold growth. XCR4 is available in 24 shades, with custom colored weld rods available, making it both practical and visually appealing.