Feature:1. Manufacturing Material: The outer tube and inflatable inner tube are made of high quality rubber material, with good friction resistance and long service life.2. Meet International Standard Air Pressure: The soft rubber material has good structural force, the inner structure of the inflatable inner tube is stable and has strong elasticity, which can fully meet the international standard air pressure, so as to better guarantee the safety performance and riding comfort of the user.3. Good Damping: Compared to solid tires, this tire is well damped, allowing you to drive on most roads, giving you a comfortable driving experience.4. Pay Attention to The Protection: It is important to note that any tire can be punctured by a incisive object, pay attention to the protection.5. Applicability: 12 x 2.125 outer tube and inner tube combination, suitable for 12 inches children bikes and children balance bicycle.Specification:Item Type: 12x2.125 Bicycle TiresWeight: Approx.470g / 16.6ozMaterial: Rubber Tires Specification: 12 x 2.125Applicability: Suitable For 12 Inches Children Bikes And Children Balance Bicycle.Package List:1 x Inflatable Inner Tube 1 x Outer Tube