The innovative design of SCHILDKROT FITNESS MF ROLLER features a firm inner roller and a softer outer roller with a criss-crossed grid of depressions in varying distances. This advanced structure enhances the massage experience and allows for the quick and continuous adjustment of intensity levels. The strong inner roll can bear the body's full weight, making it perfect for comprehensive and efficient core training. Offering both self-massage and core activation, the MF roller boasts a combined surface of nubs and ridges for targeted deep muscle treatment. Made of high-quality EVA material, this product measures 33cm in length and 14cm in diameter.