1. quality and durable rubber material with a ribbed surface provides grip, is explosionproof and pressureresistant, abrasionresistant, lightweight, and longlasting. 2. Inflatable inner and outer tires have better shock absorption and impact resistance than solid tires while being flexible enough to offer maximum protection for a safe ride. 3. Thick outer tires provide impact resistance and shock absorption. Inner tires made of butyl rubber offer good airtightness, heat resistance, aging resistance, and strong resistance to chemicals. The electrical insulation performance and long lifespan ensure maximum protection for your safe ride. 4. Made of quality rubber material to achieve the combination of various raw materials, thereby extending the tire's lifespan. The grooved rubber surface ensures grip, is slipresistant and wearresistant, explosionproof and pressureresistant, lightweight and durable, while also reducing rolling resistance.