These were collected from the nearby sea over a period of six months. They weigh approximately 230g. Some items may have imperfections in their smoothness. There may be variations in color, chips, unremoved dirt, and cracks. The coins are for size reference only and are not included with the product. They have been disinfected with a high-touch sanitizer and dried in the sun. We will pack them carefully, but there is a possibility of breakage or chipping during shipping. We may reuse empty food boxes for shipping. These have also been disinfected. Returns are not accepted. Thank you for your understanding. Material...Glass Color...Gray Thank you for viewing.