Exervo PE2 foam rollers are noted for their durability and perfect roundness in this economy foam roller category. Foam rollers are an essential tool for pilates core ab and back stabilization and strengthening. Foam rollers are used as a balance training tool to improve balance for sports, everyday balance or in a physical therapy setting. They are also an excellent aid for self massage of the upper and lower back, calf, hamstring, glutes and quads. The roller is especially useful for IT (illiotibial) band syndrome. The PE2 is produced with millions of microscopic bubbles uniformly spaced from the core to the outer edge of the roller. This consistency gives the roller the ability to slightly compress or what we call "deflect" at the surface then rebound to it"s original shape. PE2 foam rollers will "give" ever so slightly at a focused pressure point and rebound back to it"s original shape immediately. The size and uniformity of the bubbles in our PE2 roller makes it more comfortable to workout on and more durable. It"s easy to test a foam roller for deflection and rebound. Just press your thumb down hard on the foam roller for 5 seconds then release. The PE2 foam roller will rebound back to it"s original shape within a second. PE2 foam rollers are also uniformly round with no flat spots and they"re manufactured utilizing a precision extrusion process. The foam used in these rollers is the highest quality available. They are not packing foam cylinders but a precision extruded and cured product. Quality foam consists of millions of tiny cells. The cell walls are called struts. Foam produced with millions of tiny cells and supporting struts contribute to the durability and longevity of a quality foam roller. Your order will include a link to our online compilation of foam roller exercise articles and videos. Applying the Nefitco firmness scale the PE2 roller is rated Level 3- Moderately Firm.