It is used for winding and waste heat of the body before and after exercise, for the acceleration of the muscle regeneration after exercise, for the specific trigger zones treatment and is also useful as a co-ordination device. The exercises with the Blackroll can release tension in the buttocks and back and roll with the Blackroll feels like a massage (myofascial self relaxation). Ø 15 cm, 30 cm long. Made in Germany! With Manual CD.