The BLACKROLL® BALL 12 is the perfect complement for the BLACKROLL® foam roller. With its 12 cm diameter, it's just what you need for point-by-point self-massage of different areas of the body. It's larger than the BLACKROLL® BALL 08, so it's less intensive. That means it's particularly good for severely hardened and adhered areas. However, it's still small enough to access hard-to-reach areas of the body, for example on the back.