Unique design, patented structure. There is an ABS tube inside of
roller which help the EVA roller not easily deformed. Hardness of
EVA: About 25～30 degreed. 

EVA Roller: Dia. 4” x L: 45cm. or Dia. 6” x L:45cm or with Semi-round shape.

Benefit
Can be used alone, or with resistance tube for getting different strengths.
Multi-function usage . Suitable for home use, can achieve the same result as
exercising at the gym.