These multi-purpose interlocking rubber mats, sized 500mmx500mm with 15mm of thickness, are made of real rubber, black SBR, and blue EPDM raw materials, making them highly durable. Their classic interlocking design makes them perfect for DIY flooring, regardless of experience! You can outfit a large area, such as a gym floor, in a short amount of time. It’s thicker padding has exceptional cushioning properties, providing protection for your knees and joints, as well as providing less abrasion risk, with unmatched durability. This makes these mats perfect for being used under heavy equipment. Non-slip surface means equipment used on these will not move around and the surface will not become slippery when wet. It’s easy to assemble and disassemble making it easy to clean, replace, or store.