Specifications: It is a high density, heat sealed foam roller which is 30% heavier & firmer than the ones from the same class. Due to its nature, may not be perfectly straight but when you press it down, it will be perfectly functional. Designed to perform in demanding sports medicine, physical therapy and high-use Pilates and yoga sessions. 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. Diameter: 15cm/" (Approximately). Length(Optional): 30cm/11.81", 45cm/17.72", 60cm/23.62" (Approximately). Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement