Reinforced 60mm hexagonal shafts designed for usage with Mini 4WD PRO and normal Mini 4WD racers. Highly durable product is warp-resistant, making these shafts well suited for upgrading your Mini 4WD device. *Compatible chassis: Mini 4WD professional, Mini 4WD Type 3, 5, Super 1, FM, TZ, TZ-X, VS