This is a Omni ball bearing wheel, it allows you to design your own omni directional robot. The 100mm Double Nylon-Rubber Omni wheel could be mounted to 4WD Omni wheel Learning Platform, the 3WD Omni Wheel Mobile Platform. It has rollers mounted along its circumstance and the rubber rollers to avoid slip. The 100mm double plastic omni wheel is used for robotic, trolleys, transfer conveyor, shipping carts, luggage and so on. It can be combined with any of the standard hubs for direct mounting on a shaft. Key Features: Simple & Stable mounting options Unique fixed orientation Superior load capacity Make turning fast Omni directional movement and rotation. Diameter: 100mm Axial width: 35mm Number of plate: 2 Number of roller: 18 Body material: Nylon Roller Material: Rubber Roller Bearing Material: Brass tube Roller diameter: 19mm Net weight: 320g Load capacity: 20kg.