Features of CF composite 1. Low density (1.7g/cm3), 1/5 of steel\'s density (steel\'s density 7.8g/cm3). 2. CF is anisotropic material. Usually its strength is 8-10 times that of steel whose strength could reach 3500MPa in fiber direction or even 5300MPa for excellent products. Light spots of CF carbon composite mechanical arm: 1. More than 50% of the weight is lessened; 2. The power of the complete unit matches. Reducing the energy cost by 10%; 3. The lifetime is prolonged twice as much.