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| PartNumber | POLOLU-2692 | POLOLU-2127 | POLOLU-2819 |
| Description | Ball casters, Kit: ball, housing, screw, Ø:34mm, Tip mat: plastic | Sensor: position, accelerometer, gyroscope, 2.5÷5.5VDC, I2C, SPI | Wheel, black, Shaft: smooth, Pcs:2, screw, Ø:60mm, Plating: rubbe |