Under this name, a bit of technological wizardry signed X-Shape.
A reinforcement in very thick carbon composed of two strips arranged in cross under the tray, its role is to distribute the efforts on all the surface of the board and to strengthen the center, narrower, by creating a hard point by crossing.The second advantage, it is the bounce given to the tray, the pop becomes explosive especially on trays made in Lightcore. No other brand proposes you this.