Giant Dome made for Skylights is a 12" heavy duty clear type, about 4" high in center and has a 3/8" lip around edge. Inside diameter is about 11.5" and overall outside diameter is about 12.25". The thickness of the plastic is about 0.17" and the weight is about 1.25 pounds. It is heavy duty and was made for continuous outdoor use. These are brand new but have some scratches/ smudge areas from the molding process. Looks like these are perfect for large robots; outdoor solar uses; indoor/outdoor lighting, etc.These retail if perfect for $76 and up each. Sold "as-is" at a blowout price.