These are a pair of basic, 65mm wheels with black rubber tires. These wheels are the same ones designed to fit onto DAGUs right angle gear motors utilized in the Magician Chassis and RedBot Kit. With these wheels you will be able to get almost any beginners robot project moving.
Plastic gear-box motors (also known as TT-motors) are an easy and low cost way to get your projects moving. This nice, thin white wheel fits perfectly on the shaft of a TT-motor.