Used in a home gym for about a year, then stored in a storage room. *Please note that this is an imported product, so minor scratches and stains may be present. These professional-grade training mats are perfect for home training and free weight areas in gyms, and are actually used on the floors of free weight areas in sports gyms in Japan. Each mat is 50cm*50cm, 20mm thick, and weighs 4kg. These rubber mats are ideal for those who want to do本格トレーニング (full-scale training) at home just like in a gym. The 2mm surface layer is made of EPDM rubber, which is hard and provides excellent stability. You can perform high-weight barbell squats with stability. The 18mm lower layer uses SBR rubber, which provides excellent soundproofing and shock absorption. It protects 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 wipe away sweat with a cloth. You can cut it with a cutter to adjust the size even when laying it throughout a room. In addition, the included dedicated connecting parts prevent the mats from lifting or shifting. Because they connect on the back, the surface finishes beautifully.