If more details, please contact omniwheel(at)hangfa.com (1)CMA-31 Specifications: *Model Number: CMA-31 *Diameter: 310mm *Width: 167mm *Number of Rollers: 8 *Number of Bearings: 32 *Hub Material: Steel *Roller Material: Polyurethane *Hole size: 60mm *self Weight: 26Kg *Load Capacity: 650Kg (2)Application: robots , omni-directional robot platform , AGV in workhouse and warehouse, omni moving robot car, mobile electric vehicle, scientific research , aerospace industry, show equipment on stage or show cars, (3)Advantages: 1.Making turning fast 2.Omni directional movement and rotation 3.Superior load capacity