The 4 inch (100mm) double plate plastic omni wheels have rubber rollers mounted along its circumference to help avoid slipping. Each roller has two bearings allow the wheel to move smoothly and easily in ANY direction. Along with the assembled wheel, 3 nuts and bolts are included for bolting the wheel on the 6mm Nexus aluminum wheel hub or the 8mm Nexus aluminum wheel hub.
Several wheel hub options are available for you to select from below.
900 MHz Rubber Duck Antenna - Male Type F
SparkFun's minimal design approach to Arduino. This is a 5V Arduino running the 16MHz bootloader.