Features: Made of high quality materials, durable and practical. Positive and negative teeth: reduce the chain falling. Concave design: concave unique design, simple fashion style. The common BCD104 crank can be fitted with small teeth. The number of teeth commonly used in 34T (taking the 26-inch wheel group as an example) has sufficient climbing force and can accelerate the slope quickly. Specifications: Material: Aluminum Thickness: Approx. 4mm+0.05mm Color: Black/Red/Blue/Green/Purple/Gold Size: As the picture shows Note: 1.Please allow 0-3mm errors due to manual measurement. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Pair Bicycle Pedal