CNC sprockets made for Gemini by Rebel gears in Tennessee. 100% American made, high quality aluminum sprockets. Choose your size from the drop down menu to see the price. Also select whether you want a 6 hole mount, to use with stock Phatmoto rear hubs, or the 3 hole mount for Gemini hubs. The 3 hole mount should also work with the clamp on sprocket adapters.