The Champion Sports Rhino Skin Foam Disc Set is made of Rhino Skin, a durable polyurethane foam with a tough outer coating. Rhino Skin retains its original shape even after heavy use. This allows you to use the disc indoors and out, rain or shine. These discs will provide endless entertainment for your students or children, and the soft foam eliminates the fear of painful impact. This set of six discs includes one red, orange, yellow, green, and purple.