Material: Our Baby Stroller Outer Tire is made of quality rubber and synthetic materials, offering wear resistance and durability. It maintains optimal performance under various road conditions, ensuring longevity and reliability. Size: With an inner diameter of approximately 11.5cm/4.53inch, outer diameter is 13.5cm/5.31inch, the tire fits tightly and reliably for a secure attachments to your baby stroller Optimized Design: This Outer tire is specifically designed for baby stroller, featuring an optimized contour and tread pattern that provides traction and stability. It ensures the safe and comfortable transportation of your baby in any weather or terrain condition Easy Installation: Our stroller outer tire is designed for easy installation. No professional tools or complex steps are required, allowing you to conveniently replace it at home, saving both times and effort Universal Compatibility: This outer tire is compatible most baby stroller on the market, offering broad compatibility, please check your size before placing order Specification: Material: Rubber Size Chart: Inner diameter:11.5cm/4.53inch Outer Diameter: 13.5cm/5.31inch Package Includes: 1 Piece Outer Wheel Note: Please allow slightly errors due to manual measurement and different monitors.