Material: Aluminum AlloyColor: BlackScrew Dimensions: 5.3x2.5cm/2.09x0.98''Quantity:7pcsNotice:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Picture just as a reference.the actual delivered goods shall prevail2. Please allow 0-1inch deviation exists due to the different measuring way Universal Bike Compatibility: Offers a secure, consistent fit for all single-speed bicycles including mountain bikes, road bikes and folding bikes, delivering a versatile maintenance solution to keep your chain running smoothly regardless of frame model Tool-Free Effortless Installation: Features a simple, hassle-free setup with no specialized tools required for fast chain alignment and adjustment, getting you back on the road with minimal downtime Frame & Chain Protective Design: Precisely guides the chain to maintain steady tension, prevents unexpected chain slippage and shields your bike frame from scuffs, scratches and contact marks Sleek Low-Profile Styling: Boasts a smooth, integrated finish that blends seamlessly with your bike’s aesthetic, elevating its look for daily commuting, casual rides and weekend adventures Heavy-Duty Long-Lasting Build: Constructed with rugged, wear-resistant materials built to endure regular riding conditions, providing consistent, reliable performance ride after ride Size One Size Color Black Material Acrylic Brand Name linenb Model Name linenb Part Number linenb Manufacturer linenb Package Weight 140 Grams Suggested Users unisex-adult Item Package Dimensions L x W x H 0.39 x 0.39 x 0.39 inches