HPI HELLFIRE Ceramic Nitride Pro Series Ceramic Ball Bearing KitThe new Hellfire is designed from scratch with only one goal: maximum performance in all conditions! No compromise - the Hellfire is not a converted buggy or tuned up monster truck. It is purpose built to be faster and give better handling than any other competitive truck. A high level of attention to detail is paid in every area. HPI designers strove to increase performance, reduce maintenance and simplify chassis adjustments. The result is a new definition for "performance truck". Optimum Agility and Handling Hellfire features all-new suspension and steering geometries specially designed for best performance with big truck wheels and on rough terrain. A very low center of gravity gives increased responsiveness and better chassis balance. This kit contains the following ceramic bearings Eighteen 8x16 mm Four 6x10 mmTwo 5x10 mm