The product intended for import is described as a woven copper netting diffuser panel to be mounted on the window in a commercial building. The purpose of the copper panel is to allow diffused light into the space for esthetic effect and UV protection. The panel, in imported condition, will be 9 feet in length and 4 feet in width. It is stated to be mainly comprised by weight of 90 percent enameled copper wire densely woven into a panel shape which you confirmed in a phone conversation was unframed.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N282547