Killer Instinct Diesel-X Elite Crossbow Package With Lumix Speed Ring 1.5-5x32 ScopeDescription: The Diesel X features the patented, fully synchronized X Cam system which requires less effort to draw than most crossbows with its impressive 50% let off design. X Cam also produces a crossbow system that shoots quieter with less vibration for the ultimate hunting crossbow. The Diesel X measures only 6. 25 inches axle to axle when cocked, making it very comfortable to shoulder. Includes the Killer Instinct Elite Package with a Speed Ring