Step 7 Lightbox Assembly Press the silicone evenly between the corners and midpoint of the frame. This prevents excessive gathering or stretching of the fabric backing and ensures a smooth and snug fit. To remove the fabric backing from the frame, simply pull up on the tab. Pride is deeply engaged in hardware manufacturing industry. Every month we have a large number of hardware parts, fasteners, pipe products, telescopic products exported to all parts of the world. Please contact us at zhang@pride-cnc.com