This is a collection of 3 lane track lengths from 205mm to 395mm in 5mm steps, Skipping over the lengths already packaged. This track is compatible with my Mini 4wd track sections using my transition files. However, it may not be compatible with the offical tamiya mini 4wd 3 lane track due to connectors, and my lack of access to the offical track makes checking no possible at this time.