Prime grade beef is the absolute highest quality beef available, graded by the USDA. This is a very rare, and thus very expensive, only averaging about 3% of all carcasses. The beef has very minor, but a good amount of fat running through the meat, resulting in an amazingly juicy and tender cooked piece of meat. The rib-eye is a beef steak from beef rib. When cut into steaks, the rib eye is one of the most popular, juiciest and expensive steaks on the market. The extra fat makes rib-eye steaks and roasts especially tender and flavorsome. The rib-eye can be cut boneless or bone-in. Sometimes people leave the bone in for extra moisture and the fat alongside the bone will enhance the meats flavor.