Feature: 1. 360 Degree Rotation: The 100mm/3.94in heavy duty dual aluminum omni directional wheel is a rugged, double row wheel that moves easily through 360 degrees with swivel and lateral maneuverability. 2. Practical Accessories: Use the omni directional wheel, which can keep your balance ball robot running smoothly or set up a complete power transmission system. 3. Widely Used: Each roller of the omni wheel can travel independently, and the omni wheel is used for robots, carts, conveyors, carriers, luggage, etc. 4. Fine Craftsmanship: Double omni wheel uses a variety of high fine machining techniques and combines, wire cutting, stamping processing, etc. 5. Aluminum Alloy Material: The body of 100mm/3.94in omni directional wheel is made of premium aluminum alloy, which is strong and durable, corrosion resistant and has a long service life. Specification: Item Type: Omni Directional Wheel Main Body Material: Aluminum Alloy Roller Material: Polyurethane Size: Diameter: Approx. 100mm/3.94in Width: Approx. 66mm/2.60in Aperture: Approx. 12mm/0.47in Number of Aluminum Plates: 2 Number of Steel Plates: 6 Roller Bearing: Bearing Roller Load Capacity: Approx. 80kg/176.4lb/pc Suitable for Robots, Trolleys, Conveyors, Carriers, Luggage, Etc.. Package List: 1 x Omni Directional Wheel Note: 1. Due to manual measurement, 1‑3mm/0.04‑0.12in error is allowed, thank you! 2. The picture may not reflect the actual color of the item due to differences between different monitors.