There are two specifications of products,Random delivery A:4r/min B:5/6r/min The appearance of the product may perhaps alternative slightly thanks to assorted production batches. But the standard of the product is the same. Product description: This is a synchronous motor, with 2 pin terminals. Low noise. Applications: fan, heat air blower, electric heaters, burn oven, point lighting fixtures equipment, microwave oven, and other kinds of electrical appliances.