The Lucky Strike thunderegg halves are from central Oregon. They range in sizes from approx. 2 - 3 pounds each. (Stock 651-x) These formerly solid nodules have been sawed in half and colors vary from clear to blue agate with gold, red, or blue colors or green moss agate centers. They are ready to polish by placing on your flat lap or sanding unit. With the agate centers, they will take a nice polish.