Model&Size: 22206-22226, 22306-22326, 21306-21326 Material: 100% GCR15 Cage type: Brass, steel Spherical roller bearing have excellent spherical function, it works when the axle distorted or assembled eccentricity, the spherical function is changed with bearing size, constantly.Model&Size: 22206-22226, 22306-22326, 21306-21326Material: 100% GCR15Cage type: Brass, steel Spherical roller bearing