Beads of Endurabead foam heat molded to form a highly durable foam roller * Stays perfectly round even after prolonged use. Firmness rating: Level 4, Firm * About 10% softer than our very firm regular Nimbus for a less intense massage pressure * Nefitco is the exclusive authorized seller of genuine Nimbus EnduraBead foam rollers * Warranty: Two years home, one year commercial when purchased at Nefitco Fitness