Boneless Prime Rib | A5 Kagoshima Japanese WagyuLooking at how to cook this Prime Rib? Checkout this step by step guide! You are looking at an A5 Kagoshima Prime Rib. Need a Higher Grade? No higher grade exists. Want something a bit less expensive but still best in class? Check out our BMS6 7 Bone in Whole Prime Rib. Learn about how we label beef and Beef Grading Standards The Prime Rib primal cut is where we find the most tender, flavorful and desirable steaks in a steer cow. In layman's words,