18-foot diameter fiberglass hemisphere mold plus fiberglass hemisphere cover. Asking $3k or trade for a mopar project.Only the the fiberglass part is for sale. Not the visible steel structure. Can use to build a observatory enclosure for your large telescope or turn it into a pond ,swimming pool or shed . These hemispheres can be separated into quarterspheres. No delivery buyer must pick up. Three 5 two 8zero four 3 nine 9 nine.