Why do these rollers cost less ?These rollers are equivalent in quality to most similar foam rollers sold on Amazon. RumbleRoller?s Basic series rollers are manufactured from common materials, including expanded polypropylene (Basic Firm) and standard EVA (Basic Bumpy). Their shapes are optimized for molding, not for user effectiveness. And they?re smaller in size than some of RumbleRoller?s Professional series rollers. | Why do these rollers cost more?These rollers are known for their legendary effectiveness and durability. RumbleRoller?s Professional series rollers are manufactured from proprietary EVA/polyolefin blends with much greater toughness and flexibility. They benefit from a more complicated molding process. And they?re backed by multiple patents and decades of research and development. |