The outer ring consists of spongesThe inner ring is made of ABS new injection material6-inch and 10-inch yoga wheelsFactory customized yoga supplies yoga auxiliary wheel massage wheelpuYoga ring set yoga wheel Hot sale recommendation This type consists of inner ring and outer ring spongeThe inner ring is madeABSNew injection molding6-Inch 10Inch yoga wheel(Default color random，Contact customer service in advance if you need to specify the color.)