O.S. MAX-B21 Buggy Combo SetFor 1 8 nitro Offroad and 1 8GT MAX B21 is easy to use from entry level users to sports users and has excellent cost performance. Based on the O. S. SPEED series engine, it has a well balanced combination of smooth speed and power delivery can be used in both on and off road racing situations. The outer head is based on MAX 21XR B VER. 3, it has been reduced weight for better performance. Also the shape of the combustion chamber of the inner head has
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