Features: Complies with ROAR and IFMAR rules The use of an aluminum case with heat resistant magnet and double insulated windings, high precision bearings and a rotor with a robust structure ensure exceptional performance and long life. The non-adjustable rear bell built into the Hall sensor, combined with a high precision balanced rotor, provides the user with linear power on demand. The silicone O-ring fitted between the bell and stator helps conduct heat inside the motor case and prevents dust from entering the HALL sensor. Detachable frame design for daily cleaning and maintenance can effectively extend the life of this Justock engine and improve its operational efficiency. Perfectly matched with the XR10-Justock ESC for all zero racing timing specifications and also compatible with other Hobbywing electronic speed controllers, including other brands. Specifications: Battery: 2S-3S LiPo 2 POLE 1/10, 1/12 On-Road (Truggy / Drifting Car / F1 / Monster) and Off-Road (Buggy / 2WD SC Truck / Truck) Race STOCK / SPORT (choose the motor base on competition rules.) Free / casual racing for new beginners Rock Crawler (21.5T, 25.5T only) Justock Combo (ESC + Motor) available STOCK / SPORT Class application (choose motor as per race rules) 1 / 10th, 1 / 12th On-road (ex. Touring Car or Drift, F1, Mini car, etc.) Off-road (ie - buggy, 2WD SCT and truck) racing, normal training and rock crawler (21.5 only) T and 25.5T).