Features: Material: Made of aluminium alloy material, very lightweight, not easy to rust or fade, corrosion resistant and durable. Wavy Design: The wavy design on the surface not only does not damage the handlebars and stems, but also increases the friction of the product. Increase riding safety protection. Styling: CNC cutting with smooth surface and edges; the surface is anodized with bright colors and luster, making your bike more cool and fashion. Easy to Install: Installation is simple and quick, directly buckled in the handlebar installation position. Application: This reducer allows you to use smaller diameter standard size handlebars in an oversize stem. If your handlebar diameter is 25.4mm and the stem diameter is 31.8mm, then you can use "25.4 to 31.8mm" handlebar shims as a conversion. Specifications: Material: Aluminum Alloy Color: Black Package Weight: approx.10g Size: approx.41x32mm/1.61x1.25in Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 Pair of Bike Handlebar Shims Adapter