Bone in ribeye steaks (aka tomahawk steaks, cowboy steaks, cowboy ribeyes) are huge steaks cut from the intensely flavorful ribeye muscle. In addition to a hefty portion of beefy steak, each includes a single long bone offering a very impressive presentation.
This wagyu beef (aka Australian kobe beef, kobe-style beef) is raised in Australia - descended from Japanese herds. It is from a breed of cattle specially raised to increase its percentage of fat marbling to consistently high levels. More marbling leads to more flavor, tenderness, and moisture as the fat melts during the cooking process. Thus, wagyu ribeye steaks are both more flavorful and more tender than those cut from conventional beef.