Here is the blurb right from the site:
AXIS Roller Black – Round 36 x 6
Geared for moderate to heavy users, the exclusive AXIS™ Rollers give all the benefits of traditional rollers without breaking down. The AXIS’s, black, molded foam technology is firm in density, has a smooth surface, and will not lose its shape after moderate to heavy use. Fitness and rehab professionals will love the durability and lasting power of this roller.
This foam roller has survived my daily use and travels for the past two years and does the work equivalent to having a massage-therapist full-time on your staff for a fraction of a percentage of the price!