1、Smoother and powerful operation, deep lubrication, smoothly ride, labor saving, and improved efficiency 2、Special high strength steel, 3 layer nickel chromium electroplated silver anti rust, fine quenching, effective transmission. 3、Precise thread, tightly fix the hub, precise machine tool to grind the thread, riding more assured. 4、Lightly turning, running smoothly, the live flywheel turning lightly, there is only a slight "ticking" sound when running. 5、Wide range of applications, suitable for single speed, ordinary, BMX bicycles, folding bikes, etc. Item Type: Bicycle Freewheel Material: Steel Process: Fine Quenching, Special High Tensile Steel, Brown Chrome Plating,3 Layer Nickel Chromium Electroplated Silver Anti Rust Thread Inner Diameter: Approx. 34mm / 1.3in Number of Teeth: 18T Application: For Single Speed,Normal,BMX Bicycle,Folding Bike 1 x Bicycle Freewheel