Arrowmax’s all new gear differential set is designed as a direct replacement set to the original ball-differential and requires no additional parts or adjustments. The gear differential is super smooth and is maintenance-free which gives great consistency over a long period of time. It makes the car easier to drive and is suitable for all track conditions. The steel hollow shaft is 6.35mm and is made for the majority of the 1/10 F1 cars and 1/12 pan cars on the market. Available in 2 versions, for each scale of car.