Note:This product included small parts and pay attention to not to it. All the products should be used by the aged above 6 years old. Material:Steel Color: black Package Contents: 5 * Motor Gears(13T 14T 15T 16T 17T) 5 * Screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.