Unused, only used for photography. The following is the manufacturer's description: ✅ These professional-grade training mats are ideal for both home training and free weight areas in gyms, and are actually used on the floors of free weight areas in sports gyms in Japan, with high-weight specifications. ✅ Each mat is 50cm*50cm, 20mm thick, and weighs 4kg. These rubber mats are perfect for those who want to do本格 training at home, just like in a gym. ✅ The 2mm surface layer of EPDM rubber is hard and provides excellent stability. High-weight barbell squats, etc., can be performed stably. The 18mm lower layer uses SBR rubber, providing 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 sweat can be wiped off easily with a cloth. ✅ Even when laying them throughout a room, you can cut them with a cutter to adjust the size. Also, the optional dedicated connecting parts prevent the mats from lifting or shifting. Because they connect on the underside, the surface finishes beautifully. ✅ When unpacking, rubber dust may be present in the cardboard box, but this is due to the specifications and will decrease with use and eventually disappear, so please rest assured.