Reference Series (RF) [3.75" wide, 2.5" deep] Rather than using more conventional snaps the Enlightor-4K fabric is affixed to the frame by means of a self tensioning groove system. Once locked in place its tensioning ensures the fabric is evenly supported and free of ripples. With such attention to details the Reference Fixed frame's eight-piece screen guarantees a perfectly flat projection surface. Options include VistaCurve and magnetic masking panels.