Acrylic.
SIMPLE TWO PIECE set-up; black acrylic back slides in from the bottom to hold the flag in place; Flag box display case made for the 5' by 9.5' flag size .
WALL MOUNTS on back for simple invisible hanging .
FREE MICROFIBER cleaning cloth included , HAND CRAFTED with polished edges and UV protection .
DISPLAY AREA Dimensions are 23.5 inches long, 2.5 inches deep, and 12.25 inches high (deduct 3/16" each way for interior dimensions)