Features: 1. Labor-saving, fast and accurate gear shifting: lightweight, precise and flexible aluminum alloy performance reduces fatigue during long-distance driving. 2. The positive and negatives teeth prevent the chain from falling off, the positive and negatives teeth are designed to prevent the chain from falling off, and the joint positions of the positive and negatives teeth are all circular arcs , Transition, refuse the accumulation of sediment. 3. For positive and negatives teeth, the width of the tooth tip is large, the tooth height, and the disc thickness are large, and the chain can move with a smaller hole. 4. Fully hollowed out lightweight design, does not add burdens to your bike. 5. High-strength aluminum alloy is cut to shape, super durable. Notice: ①Actual color may be slightly different from the image due to different monitor and light effect ②Please allow 1-3cm deviation due to manual measurement Material: Aluminum alloy BCD: 130mm Color: As picture show Package List: 1xFolding Bike Tooth