The Hero Rubber + Nike Grind Sole Cycle Zoom Collection delivers high performance materials with recycled rubber made from post-consumer athletic shoes. It has a 20% construction made from Nike Grind and is crafted without recycled tires or crumb rubber, making it a super clean product. This rubber flooring is approved for areas with free weights when using 8mm thickness or greater. It's available in square tiles and interlocking tiles. Size options - 24"x24"Square/Interlocking, 24"x36"Square, 38"x38"Square/Interlocking, 48"x72"Square/Interlocking