Feature: 1. High Quality: Made of high quality materials, durable double row wheels, 360° rotatable, light movement, solid structure, suitable for different environments, low maintenance cost. 2. Directional Wheel: Omnidirectional movement and rotation, with rotation and lateral mobility, it is easy to control and track the direction, making the steering faster than ordinary wheels. 3. Strong and Stable: Equipped with plastic circular and cross shaft couplings. It makes the omni directional wheel more firm, the fixed direction is clear, the installation selection is simple and stable, and the load stability is excellent. 4. Widely Application: 48mm omni directional wheels are designed for ground and inverted applications, such as manual and electric transmission systems, such as rail transportation, workstation turntables, robot wheels, etc. 5. Stable Performance: Professional manufacturing, craftsmanship and high accuracy help to provide stable performance to meet your various needs. Specification: Item Type: Omni Directional Wheel Color: Black Grey Body Material: Nylon Roll Material: TPR Wheel Diameter: 48mm / 1.9in Wheel Width: 25mm / 1.0in Roll Diameter: 13mm / 0.5in Weight: Approx. 56g / 2.0oz Load Capacity: 2kg / 4.4lb Suitable: for Robot Competition 14108. Package List: 1 x 48mm Omni Directional Wheel 2 x Shaft Coupling2 x Screw Note: 1. Manual measurement, allowing 1‑3mm error, thank you!2. Due to the differences between different monitors, the picture may not reflect the actual color of the item.3. Give a round and cross shaft as a gift. You need something to knock in when matching. After knocking in, you may not be able to take it out. Please use it carefully.