Durable Steel Frame: The mountain bike is made of high-quality high-carbon steel . and the welding technology is tightly connected. It is resistant to falling . waterproof . and rust . and can be used for a long time. 26″ Extra Thick Rubber Tire: The extra-thick rubber is puncture-resistant . reducing the risk of tire blowouts during use. The sturdy and impact-resistant rim prevents tire deformation. Easy to Change Gears: The handle is designed with a handle shift lever. The front wheel can adjust three gears . and the rear wheel can adjust seven gears . which can realize 21 super smooth speed changes. Anti-slip Design: The side design of the handle prevents the hand from sliding down. The pedal surface is protruding . which can effectively prevent dangerous situations caused by slipping.