CHOOSE DMASUN: DMASUN is a professional sports brand that seamlessly integrates the design, production, sales, and service of sports products. With over 30 years of experience, our products are widely distributed across the United States, Canada, Japan, Britain, Germany, and other countries. We have successfully delivered fitness products to more than 2 million households. This is a brand you can trust. WHY IS THE DMASUN EXERCISE BIKE SO STABLE AND SAFE? The DMASUN exercise bike is equipped with a 35 LB fully filled solid flywheel and alloy steel that is thicker than other products, ensuring a sturdy construction for a smooth ride. Users who weigh more than 330 LB can also use it with confidence.The products have been tested for anti-fall before leaving the factory, so they are of higher quality and more secure.