Features: Light weight, this crankset offers a significant boosts in climbing efficiency. Make from high strength Aluminum Alloys, this crankset ensures durability and light weight performances. Features a narrow wide tooth designs, reducing chain drop and enhancing chain retention. The chainring is engineered to light, enhancing pedaling efficiency. Designs for 104BCD cranks, ensuring a perfectly suitable for a wide ranges of mountain bike setups. Specifications: Materials: Aluminum alloy Styles: 40T black/40T redness/42T black/42T redness 40T diameter: about 167.65mm/6.6inch 42T diameter: about 175.75mm/6.92inch Package Includes: 1Pc Chainring Wheel note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.