1It adopts omnidirectional ball copper set of wheels, and is equipped with rubber rollers to avoid slipping and make it more durable. 2100mm double plastic omnidirectional wheels, durable double row wheels, can easily carry out 360 movement, rotation and side mobility. 3Omnidirectional movement and rotation, easy direction control and tracking, make turning faster than ordinary wheels. 4Clear fixing direction, simple and stable installation options, excellent load stability. 5Different types of standard pivot shafts can be directly connected. Suitable for Robot Racing Wheel 14049. Item Type: Double Omni WheelNumber of Boards: 2Number of Rollers: 18Body Material: NylonRoller Material: RubberRoller Bearings: Brass TubeCarrying Capacity: 20kg/44.1lbRoller Diameter: Approx. 19mm/0.7inWheel Diameter: Approx. 100mm/3.9inAxial Width: Approx. 18mm/0.7inWeight: Approx.319g/11.3ozCompatible: Suitable for Robot Racing Wheel 14049 1 x Omni Wheel3 x Screw