Compatibility: Black leopard, Green Leopard, White Leopard, White Leopard Step-thru MODEL: Shimano MF-TZ500-7 Multiple Freewheel. Weight is 0.42 kg. SIZE: 14-28 Teeth ,threaded type hub 7 speed freewheel provide convenient and efficient gear shifting for all riders. MATERIAL:Made of high-quality metal, corrosion-resistant and long service life.The internal thread has high precision, smooth rotation and easy maintenance. HG SPROCKETS:The uniquely designed HYPERGLIDE sprocket combines a specially positioned shift ramp and tooth profile to improve chain control during shifting.