【Official Karate Mat】 This is a red karate mat from Fuji Sports Kogyo. FSK Fuji Sports Kogyo (Ltd.) Karate Mat Color: Red Use: For karate There are 6 mats in total. I used them for practice at home. The edges of the mats will produce a powder-like substance when rubbed. (The edges are slightly deteriorated?) Although there are some scratches and stains as they are used items, they can be used without any problems.