Pillowcase design: Simply slip the pillowcase-like pattern over the frame and zipper it closed. The invisible zipper tightens the stretchy fabric and displays your image perfectly. Tension Fabric: 230gsm Stretch-Poly Fabric is heat sublimated to showcase images with clarity and vibrancy. 8FT x 8FT Straight Display Backdrop. Easy graphic replacement: Showcase different images in seconds by swapping out the pillowcase-style graphic covers.