Board building elements are specific features of a board that together define the overall characteristics of a deck. Examples of elements are: Kick tails - the length of deck extending from the outside edge of a truck baseplate to the tip of the skateboard. Concave - the downward curvature of the board deck perpendicular to the length of the board Rocker - the downward arc of the board over the length Camber - the upward arc of the board over the length Transition - the point at which elements meet for instance, the point at the outside edges of the deck where the concave flattens out and moves to the kick tail