This replacement wheel and retainer set (model numbers 3900-5904 and 00801-1451) is engineered to restore smooth operation and stability for compatible ride-on vehicles. Crafted from high-quality plastic, the components are designed for durability and consistent performance on various surfaces. The retainer ensures a secure and reliable fit, minimizing slippage during use. Ideal for replacing worn or damaged parts, this set fits select models commonly used in early childhood ride-on toys. Installation is straightforward, making it a practical solution for quick maintenance and continued play.