The rookie features a modern concave which allows for not only comfort, but more pop making it easier to learn tricks. These boards include a professional assembly. All Krown skateboards arrive assembled and ready to ride straight out the box. The Rookie model includes heavy duty Aluminum 5.0 trucks, 52mm 99A high-rebound urethane wheels, precision speed Abec 7 bearings, high tensile Philips head mounting hardware, and 80 grit black grip tape. Each component meets the industry standards and are a common choice of skaters worldwide.