Marbling is the fat which is present within meat . The more marbling that exists within the meat, the higher the quality and the higher the grade given to the meat, such as Prime or Choice. When cooked, the extra fat content makes the beef more tender and flavorful. Here at Crazybutcher.com, we choose only the highest grades of CHOICE and PRIME specifically for this reason. These grades offer a juicy, tender steak. As always, even the best steak can be overcooked. Cooking a great steak is a wonderful art and sharing this with others is a great pleasure. Suggested internal temperatures for meat are: 145 _ F = medium rare; 160 _ F = medium; and 170 _ F = well done.