There are two specs of products,Random shipping A:4r/min B:5/6r/min The appearance of the product may well update slightly due to diversified production batches. But the quality of the product is the same. Product description: This is a synchronous motor, with 2 pin terminals. Low noise. Applications: fan, warm air blower, electric heaters, burn oven, point lighting equipment, microwave oven, and other kinds of electric appliances.