CC type adopts two pieces of high-quality steel plate cage, C-type self-aligning roller bearing is the second-generation design of Ba type compared with the traditional design. Their characteristics are steel plate cage and reinforced symmetrical roller. After optimized design, they have much higher rated load than traditional products, wide application range and long service life. CA type is solid copper cage, CC type is stamping steel cage, both can be used in general occasions, but ca self-lubricating ability is good, CC noise is relatively large.