该产品用于特种空心杯电机，具备以下特点：
These manetic rings are mainly used in the coreless brushless DC motors, which have following features:
1. 产品性能稳定，一致性好。
Have stable and good consistence in magnetic properties.
2. 产品精度高，平衡量小。尺寸公差和形位公差都在5丝以内，可以根据客户要求定制2丝以内的产品。
High precision: All products' dimensional and geometric tolerance are controlled within 0.05mm, some special products are within 0.02mm according to customer's requirement.
3. 耐腐蚀性好，可以做到2mg/cm^2的低失重，表面处理盐雾试验要求可以达到72H以上。
Good corrosion resistance: weight lost less than 2mm/cm^2, and surface coating can reach 72H above.
