Designed to perform in demanding sports medicine, physical therapy and high-use Pilates and yoga sessions, the roller with the highest density is MSG black foam roller. Relieve tight or injured muscles, perform active release therapy on trigger points and knots, self-massage soft tissue and roll away soreness. Professionals use high-density rollers to roll out tough muscle adhesions in the heavier lower extremities including the iliotibial band (IT band), piriformis, hamstrings or quads. Super easy use, no need other people's help. Made by high quality ABS plastic, long working live. Specification Size: 27*25cm Material: ABS plastic Weight: 380g Excellent for a variety of training and rehabilitation exercis