This free parts bag includes dog bones and axles for the TT-01 framework. It offers 2 long and 2 short axles. The quick axles are utilized the front of TT-01, which will give the TT-01 a track width of 185mm. The long axles are employed for the back for the TT-01, that may supply the TT-01 a track width of 190mm. Note: you'll need the long axles only if you might be using a body set which includes a wider rear tract/width. Example: The Ferrari Enzo plus the Porsche 911 have a wider rear track, therefore long rear axles are acclimatized to widen the trunk of TT-01 to ensure a genuine to measure appearance. When using Tamiya human body sets that are 185mm wide for the front side and rear only use the front axles as replacements or purchase item 9005713, which includes 4 quick axles.