Eva Hollow Yoga Column, Foam Shaft Balance Bar(Black) The product is shipped based on the color or size of the main image of the product page. Colour:black [Product material]: EVA outsourcing + PVC inner tube, yoga column [Product specifications]: length 33 cm, diameter 14 cm Medium density muscle roller is comfortable to use - making it easy for beginners , but still effective at penetrating the soft tissue layer of tired muscles . Soft enough to use while in pain from lower back injury , sciatica or plantar fasciitis . One of the best recovery tools to treat muscle pain , increase performance and flexibility. Rolling before and after exercise sis part of a great stretching routine . Increases blood flow to massage site , flushing away stored lactic acid . Stretch overworked and strained muscles of the leg , arms , and feet by rolling during your warm up and cool downs . Provides instant benefit to the hamstring , IT band , glutes , and calves by delivering superior massages at home or in the gym . Loved by runners , exercise athletes , yoga and pilates students , swimmers , physical or sports therapy patients , and aid those just doing a normal fitness workout . Great for the arch of the foot , and any part of the superior body but the spine or neck .