1. It adopts omnidirectional wheel set and is equipped with rubber rollers to avoid slipping and make it more durable. 2. 100mm double omnidirectional plastic wheels, durable double-row wheels, can easily perform 360° movement, rotation, and lateral movement. 3. Omnidirectional movement and rotation, easy direction control and tracking, make turning faster than ordinary wheels. 4. Clear fixing direction, simple and stable installation options, excellent load stability. 5. Various types of standard caster axles can be connected directly. Suitable for Robot Racing Wheel 14049. Item Type: Double Omni Wheel Number of Boards: 2 Number of Rollers: 18 Body Material: Nylon Roller Material: Rubber Roller Bearing: Brass tube Load Capacity: 20 kg/44.1 lb Roller Diameter: Approx. 19 mm/0.7 in Wheel Diameter: Approx. 100 mm/3.9 in Axial Width: Approx. 18 mm/0.7 in Weight: Approx. 319 g/11.3 oz Compatible: Suitable for Robot Racing Wheel 14049 1 x Omni Wheel 3 x Screw