Feature:1. TPU rubber rollers are made of high-quality polyurethane TPU material, with good friction and extremely long service life2. All parts except TPU rubber roller are made of aluminum, which will not be easily deformed3. Allows the robot to achieve allround motion while supporting larger loads4. The main body is stamped from aluminum, which has good rigidity and strong impact resistance.5. TPU rubber rollers use one bearing at each end for smoother operation and strong loadSpecification:Item Type: Macanum WheelDiameter: Approx. 100mm / 4.0inWheel Width: Approx. 50mm / 2inComposition: TPU rubber rollers x 9 + wheels hub are stamped from aluminumFeatures: 45 degree omnidirectional wheel, single wheel load 30KG.Each TPU rubber roller is equipped with two bearings.Package List:1 x Macanum Wheel(left)1 x Wheel CouplingNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.