Type：freewheel. 12 teeth design. Material: steel. Color：seen in the picture.
12T Teeth Single Speed Freewheel Sprocket Gear Bicycle Accessories FreewheeR HJ
12T Teeth Single Speed Freewheel Sprocket Gear Bicycle Accessories Freewheeyu
SG Store 2Pcs 12T Teeth Single Speed Freewheel Flywheel Sprocket 34mm Large Diameter Bike Bicycle Flywheel Pinion Electric Vehicle Accessories
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Versatile Steel Single Speed Freewheel Sprocket Gear Options of 12T14T16T18T
