Rubber outdoor interlocking tiles are designed for the home gym flooring industry. The black recycled rubber tiles with 10% gray speckles offer the gym floor a luxurious appearance. Rubber tiles that are 5/16 inch (8 mm) thick protect the floor from vibrations induced by exercise equipment like treadmills. https://modutile.com/product/interlocking-rubber-floor-tiles-23x23-8mm/