These marbles are handmade from glass rods. The color rods are mixed and twisted to form the color combos. once the glass is done, it is put in an annealer where it is brought up to 1010 degrees F. It is then brought done to room temperature or the course of 10 hrs. This process is down to help prevent the glass from breaking due to temperature changes around it. Color may vary based your screen. Marble stand sold separately.
