Why are hard rollers called magnetic rollers?

Hard rollers are often referred to as magnetic rollers because they incorporate magnets into their design, which can provide additional benefits during use. The magnetic properties are believed to enhance blood circulation and promote muscle relaxation, potentially improving recovery and reducing muscle tension. Additionally, the term "magnetic" can refer to the roller's effectiveness in attracting and relieving tightness in muscles, similar to how magnets attract materials. Thus, the name reflects both the physical characteristics and the therapeutic benefits associated with their use.