Our frame is made of 6061 aluminum alloy, the frame has undergone a fatigue bump test with a weight of 70KG, 30W times, and the defective rate is 0.48% (excluding shipping problems and electronic parts line problems caused by after-sales), our parts suppliers are well-known brand suppliers, the product has all kinds of patent certificates 45 +, each process has quality control, the whole car ride test before shipment.