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Features: *100% brand new and high quality *This is a great electric motor gearbox used for children's cars. *The middle gear is made of metal which is more sturdy and durable. *It will make quite low noise and more wear-resistant. *There are different voltage and speed that you can choose as need. *It will be a great replacement part for your broken or old ones Specifications: 1、550 Type: 6 Teeth *Type(Optional): 550-12V-8000 Turn, 550-12V-10000 Turn, 550-12V-12000 Turn, 550-12V-15000 Turn, 550-12V-18000 Turn, 550-12V-23000 Turn, 550-12V-30000 Turn, 550-6V-8000 Turn, 550-6V-10000 Turn, 550-6V-14000 Turn, 550-6V-18000 Turn, 550-6V-20000 Turn *Total Length: 550 18.5cm(Approx.) *Hole Diameter: 550 1.2cm(Approx.) 2、RS390 Type: 5/6 Teeth *Type(Optional): RS390-12V-16000 Turn 5 Teeth, RS390-12V-20000 Turn 6 Teeth, RS390-6V-18000 Turn 6 Teeth, RS390-6V-16000 Turn 5 Teeth *Total Length: RS390 16.5cm(Approx.) *Hole Diameter: RS390 1cm(Approx.) Package Contents: 1*Gear Box Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data.