I used these for soundproofing in my apartment for about two years (I put a rug on top of them partway through). I bought them for about 20,000 yen each from Rakuten, Amazon, or some other online shop. I'm selling three of them together. They're similar to the mats made by brands like Caraz, and they were probably made in Korea. They're thick enough to handle kids playing or doing light exercise on them. The color is light gray, so they'll blend in with your interior. You can fold them up when you're not using them. I'm selling them because I don't need them anymore. I'm selling them as a set of three. The price reflects the shipping costs. As you can see in the photos, there are some loose threads on the edges and some light stains on the surface. Please be aware of this before you buy. Play mat for babies, foldable, thick, waterproof, seamless. Suitable for nurseries, daycare centers, and sports gyms.