WOODLAND SCENICS-Project Base/Backdrop: Small. This is a perfect way to start your diorama project for school. This package contains one 12-1/2x9-1/4x9-5/8 inch project bases and backdrop, three labels, four pieces of double-sided tape and instructions. Conforms to ASTM D 4236. For ages 7 and up. CAUTION: Cutting tool recommended. Use with care. Adult supervision required. Imported.