The Hoyt Concept X 37 and 40 represent the exceptional engineering archers expect from Hoyt. With a riser, limb system, and cam system all designed to complement each other, the Concept X gives shooters an extremely stable foundation for seeking out target archery perfection. Starting with a riser that minimizes rotational translation, adding a limb system that is the most torsionally stable we have ever designed, and wrapping it up with the SCTR cams - the culmination of two decades of Hoyt Cam & 1/2 and HB cam systems rolled into one. The Concept X beats the standards you expect from Hoyt.