Features:1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Using highhardness steel, good toughness, impact resistance, bearing quality and motor service life are improved, very durable.4.High temperature resistance, high wear resistance, strong carrying capacity, sturdiness and durability, effectively protecting the gearbox motor body.5.The lower the speed, the greater the power, and the lower the sound; on the contrary, the higher the number of revolutions, the lower the power, the greater the noise, and the faster the running speed.Specifications:Material: MetalColor: SilverSize: 8.6x3.8cm/3.39x1.50inch(LxW)Weight: 458gPackage include:2 x Cable4 x Gear2 x Children Electric Car Motor