Check the listing for details. 10Pack RED 6573 Technic Gear Differential, 24 -16 Teeth Differential Gear Casing. Color: Yellow, Condition: New. Listed at 13.30 USD. 【Features】Compatible with major brand all series of classic building blocks. 【How to play】The building block system can be expanded to add more interesting elements to make your buildings more diverse and interesting. 【Material】All are made of environmentally friendly materials, such as ABS plastic, which is safe and non-toxic, and can be used with peace of mind. 【High Cost-Effective Price】If you need a bunch of similar building blocks, but want to save a little money when buying big brands, this set is perfect. 【Service】Our products have passed the CPC certification, the quality is guaranteed, you can buy with confidence. If you have any questions, please feel free to contact us so that we can provide you with the best service.