These miniature tank tracks are great for small, indoor, tracked robots. Each track link is injection-molded from ABS, and the links are held together by 1/16" stainless steel dowel pins. The track is 0.9" wide, and the pins are spaced approximately 0.54" apart. These tank tracks are smooth for operation on one of the most common types of terrain that your robot might encounter: carpet!
The picture to the right shows a belt of 18 links, with 8-tooth sprockets on both ends. 18 links is close to the minimum practical belt size, while 50 links per belt would be getting close to the longest practical track length.