This free elements situation includes dog bones and axles the TT-01 framework. It provides 2 long and 2 quick axles. The fast axles are used the key section of TT-01, which will supply the TT-01 a track width of 185mm. The long axles are used the backside about the TT-01, that could provide TT-01 a track width of 190mm. Note: you'll need the long axles only if you're making usage of a body set including a wider back tract/width. Example: The Ferrari Enzo as well as the Porsche 911 have a wider rear track, consequently long straight back axles are used to widen a large part from the TT-01 to ensure a genuine determine appearance. Whenever using Tamiya human body sets that will be 185mm wide for both front and backside just utilize the front part axles as replacements or purchase item 9005713, including 4 fast axles.