✅ Brand new set of 4 authentic rubber mats, 50cm square and 20mm thick. These mats have a stylish pure black color, not the usual mix of white chips. They are heavy and won't shift, providing stable placement. ✅ These professional-grade training mats are perfect for home training or free weight areas in gyms. They are actually used in free weight areas of sports gyms in Japan, and are designed to withstand heavy weights. ✅ They provide stable support for heavy barbell squats and offer excellent soundproofing and shock absorption. They effectively protect the floor from damage. Surface hardness is approximately 65, and bottom hardness is approximately 45. ✅ The EPDM material sheet on the mat surface is smooth and does not absorb water, so you can easily wipe away sweat with a cloth.