Feature: 1. It adopts omnidirectional ball copper set of wheels, and is equipped with rubber rollers to avoid slipping and make it more durable. 2. 100mm double plastic omnidirectional wheels, durable double row wheels, can easily carry out 360° movement, rotation and side mobility. 3. Omnidirectional movement and rotation, easy direction control and tracking, make turning faster than ordinary wheels. 4. Clear fixing direction, simple and stable installation options, excellent load stability. 5. Different types of standard pivot shafts can be directly connected. Suitable for Robot Racing Wheel 14049. Specification: Item Type: Double Omni Wheel Number of Boards: 2 Number of Rollers: 18 Body Material: Nylon Roller Material: Rubber Roller Bearings: Brass Tube Carrying Capacity: 20kg/44.1lb Roller Diameter: Approx. 19mm/0.7in Wheel Diameter: Approx. 100mm/3.9in Axial Width: Approx. 18mm/0.7in Weight: Approx.319g/11.3oz Compatible: Suitable for Robot Racing Wheel 14049. Package List: 1 x Omni Wheel 3 x Screw Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.