A.C. Gilbert Hall Of Science Girder & Building Panel Set. Condition is New. Please view the photos as they are part of the description. The set has never been used or opened. Shipped with USPS Priority Mail to the lower 48 states only. No PO Box. Please pay immediately at end of the auction. No returns accepted. Please note that there was a limited run of these custom sets made. They are very hard to find. This would go wonderful on any American Flyer Train Layout.