This extra components bag includes dog bones and axles the TT-01 chassis. It includes 2 long and 2 brief axles. The short axles are utilized the front side associated with the TT-01, that will supply the TT-01 a track width of 185mm. The long axles are used for the backside associated with the TT-01, which will give the TT-01 a track width of 190mm. Note: you will require the long axles only when you might be using a body set which has a wider rear tract/width. Example: The Ferrari Enzo and also the Porsche 911 have a wider rear track, consequently long rear axles are accustomed to widen the rear of the TT-01 to make certain a true to scale look. When working with Tamiya human body sets that are 185mm wide for the front and rear only make use of the front axles as replacements or purchase product 9005713, which include 4 quick axles.