Available 1/4", 3/8", 1/2" and 3/4" thick A proprietary manufacturing process ensures that these rubber gym mats withstand even the most extreme environments and will always lay flat without curling up Ultimate rubber gym mats are manufactured using a special process to reduce sharp chemical odors These mats can be used as individual mats or lined up wall-to-wall to cover larger areas. (Please note that unlike puzzle tiles, these mats do not lock together). Ultimate Stand-Alone Gym Mats are offer premium protection and durability for the most demanding workout environments. These indestructible rubber mats are designed for use as punishment pads in aerobic and weight-lifting areas.