These Canyon Rugs are super sized at 72 in. x 36 in. The half round hearth rugs are made of synthetic fibers which perform similar to nylon but have slightly lower melt temperatures. These rugs meet the CPSC standard FF 1-70 for flammability of carpets. Carpet will not continue to support combustion once the ignition source has cooled or been removed. The ember that pops out may char a spot on the hearth rug but the rug will not burn. It will protect the underlying surface.