Tiger tail the big onethe new king of foam rollers is sleek and powerful easily break up muscle knots and release tightness great for sore backs it bands gluts quads hamstrings calves and more with a rigid hollow core and hefty foam construction the tiger tail big one is a sturdy heavy duty foam roller ideal for knots built to last with tiger tails stamp of quality wont break down featureshigh quality materialssturdy built to last wont break downsmooth surface is easy to clean n