1、Compatibility: This omni directional wheel is equipped with hub compatible for NXT and the axle center hub for motor. 2、Double Row Wheel: Made of premium materials, durable double row wheel, 360 degrees rotation, lateral maneuverability, sturdy structure, suitable for different environments, low maintenance cost. 3、Omni Directional: If you use this omnidirectional wheel on the robot, it can move forward, backward and rotate without changing its direction. 4、Coupling: It is equipped with plastic round and cross shaft coupling, which makes the omni directional wheel more strong, the fixed direction is clear, the installation selection is simple and stable, and the load stability is excellent. 5、Application: 58mm omnidirectional wheel is designed for ground and inverted applications, such as manual and electric transmission system, feed guide rail, workstation turntable, robot wheel, etc. Item Type: Omni Wheel Material: Nylon, PE Gross Weight: 77g / 2.7oz Type: RC Accessories Color: Black grey Wheel Diameter: Approx.58mm / 2.3in Wheel Width: Approx.26mm / 1.0in Drum Diameter: Approx.13mm / 0.5in Wheel Aperture: Approx.12mm / 0.4in Number of Rollers: 10 Load Capacity: 3KG Applicable: for robot kits and servo motors 1 x 58mm Omni Directional Wheel 2 x Coupling 2 x Screw