This is the summary of consumer reviews for Black High Density Foam Rollers - Extra Firm (Half and Full Round). The BoolPool rating for this product is Excellent, with 4.60 stars, and the price range is $8.10-$32.50 (Based on size and shape).

Black High Density Foam Rollers are molded with high quality polyethylene foam technology that gives all the benefits of standard rollers without breaking down. The extra firm density offers superior support, strength and ultimate stretching. The smooth surface does not lose its shape after moderate to heavy use. The extra firm roller is designed to provide deep tissue massage, which help in relieving pains, stiffness and muscle soreness. Highly durable, these rollers are loved by fitness and rehab professional for its lasting power. These High Density Foam Rollers are available in different sizes to suit one's requirement.

However, some users do not find these rollers worth the price. 

Overall, the Black High Density Foam Rollers - Extra Firm are highly recommended by users for increasing blood flow circulation, flexibility of soft tissues and to alleviate muscle soreness.