The frame is designed through multi-layer technology and adopts anti-collision safety materials. The impact absorption angle structure can disperse serious impact. The high-quality material coating can be gently grasped to prevent calluses. When in use, it will not feel uncomfortable due to sweating, and can enjoy the charm of sports. Adopt unique high-quality rubber material, smooth but non slip; This material is easier to wipe and clean. Safe, non-toxic, harmless and odorless. Made of high-quality cast iron core to improve durability, toughness and stability. The solid structure will not break or bend after repeated use.