Features: Transform your foldings bikes performances with our innovative 3 speed external freewheels, integrating a cassette for a wonderful upgraded. Craft from aluminum alloys and steel, this freewheels designs ensures a lighter, more efficient ride with safety shifting. Great for foldings bike enthusiasts and cycling modifiers who want enhances portability and multifunctionality in their ridings. Perfect for commuters seek smooth transitioning across varying terrains and frequent stops, this freewheels offer the flexibility need for city life. Elevates your cycling experience with precisions assembly that ensures smooth and precise gear changes, making every parking or ridings. Specifications: Materials: Aluminum Alloys, Steel Color: As The Picture Shows Package Weight: approx.119g Diameter: approx.7.0cm/2.75in Package Includes: 1Pc 3 Speed Cassette Freewheels note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!