Material: Made of precision NC control 7075 and 6082 aluminum alloy, high quality anodized and stainless steel parts.Features: 1. Lightweight design 2. The dial is clear and easy to read and secure the position of the wheels.　　　　　　　 ?3.Fashion design. 　　　4. Very suitable for course and town. Installation: Simply turn the small adjuster by hand to correspond with the adjuster dial, and you can make 100% accurate arrangement on both left and right sides.If you have any questions, please follow the instructions to install.