1. Equipped with aluminum alloy wheels, inflatable/solid tires are optional, 6mm/8mm bearings are optional, can be directly replaced and installed, convenient and laborsaving, saving you time. 2. Easier to install and disassemble, saving time and improving efficiency. Tires of the same model are largely compatible. Please check the images before ordering to confirm tire size and compatibility. 3. Using quality rubber materials, the combination of various raw materials can be achieved, extending the tire's lifespan. With a grooved rubber surface, it provides grip, is antislip, wearresistant, pressureresistant, lightweight, durable, and reduces rolling resistance while ensuring aesthetics. 4. Inflatable inner and outer tires have better shock absorption and impact resistance than solid tires while maintaining good flexibility, offering maximum safety protection. Solid tires are easy to use, no inflation needed, no punctures, no fear of nail penetration, maintenance, and always in condition. This allows the tire to withstand all pressure changes and remain as strong as a regular tire when fully inflated.